Latest / The Email Marketing Podcast with Fexingo: Newsletters, Open Rates, and Subscriber Growth / Why Email List Scarcity Boosts Subscriber Value
Transcript
- Lucas: You know, we've talked a lot about how to grow your email list — bigger is better, more subscribers means more reach. But there's this counterintuitive strategy that some of the savviest marketers are using right now, and it's the exact opposite: they're intentionally keeping their lists small. Luna: Scarcity. Deliberately limiting supply to boost demand. I've seen this work in e-commerce with limited drops, but for email lists? That feels risky. Lucas: It does. And yet, the data is compelling. Let me give you a concrete example. There's a B2B SaaS company — I'll call them 'ProjectFlow' to keep it generic — they had a newsletter list of about 80,000 subscribers. Decent open rates, around 22 percent. But they decided to experiment. Luna: What did they do? Just delete 50,000 subscribers? Lucas: Almost. They ran a re-engagement campaign. Anyone who hadn't opened an email in the last 90 days got a 'are you still interested?' email. If they didn't click within a week, they were removed. They also stopped list-buying and stopped gating all their content behind email opt-ins. Within three months, their list shrank to about 32,000 subscribers. Luna: So they lost sixty percent of their list. That's terrifying for most marketers. Lucas: It is. But here's what happened next. Open rates jumped from 22 percent to 41 percent. Click-through rates went from 3.2 percent to 7.8 percent. And — this is the kicker — their overall revenue from email actually increased by 18 percent. Because the people who remained were genuinely interested, and they clicked more, bought more, and complained less. Luna: So the signal to noise ratio improved dramatically. Fewer unengaged people dragging down metrics, and the engaged ones got more attention. Lucas: Exactly. And there's a psychological layer here too. When you make your list feel exclusive, people value the membership more. Think about Morning Brew. In their early days, they used a waitlist. You couldn't just sign up — you had to wait. That scarcity created buzz. When you finally got the invite, you felt like you'd earned something. Luna: Same with The Hustle before HubSpot acquired them. They had that 'invite-only' vibe for a while. It made people talk about it. 'Hey, I just got into this newsletter, it's really good, you should try to get on the list.' Lucas: Right. And both of those newsletters eventually opened up, but by then they had a loyal base that really wanted the content. The scarcity wasn't artificial — it was a genuine constraint during their growth phase. And it set a tone of quality over quantity. Luna: But that strategy only works if your content is actually worth waiting for. If you're just sending the same generic tips everyone else sends, scarcity just makes you look pretentious. Lucas: Absolutely. The scarcity tactic is a forcing mechanism for better content. You have to be ruthlessly selective. Which is actually a good discipline. Instead of blasting out a daily email that's 80 percent filler, you send one a week that's genuinely useful. Luna: So who should try this? Every marketer? Lucas: Not everyone. If you're a retailer with a broad product catalog and you need volume to move inventory, scarcity might hurt you. But if you're a media company, a B2B SaaS, or any brand where thought leadership drives revenue, a smaller, highly engaged list is more valuable than a huge, sleepy one. Luna: What about the technical implementation? How do you create scarcity without alienating people who actually want your content but just haven't opened lately? Lucas: That's the nuance. You don't want to purge everyone who's been busy. The key is to use engagement scoring. Give every subscriber a score based on opens, clicks, and replies over a rolling window — say, the last 90 days. Then set a threshold. Anyone above it stays; anyone below gets a re-engagement sequence. If they don't respond, they're removed. Luna: And you can also use scarcity on the front end. Like a limited signup window. 'Our newsletter opens for new subscribers once a month. Sign up now or wait until next month.' Lucas: Yes. That creates a natural urgency. I've seen brands do this and get a 400 percent increase in signups during that open window compared to a permanent 'join now' button. It's the power of deadlines. Luna: But what about the people who miss the window? Do they just forget about you? Lucas: You can capture them with a waitlist. Have them leave their email and send a confirmation that says 'you're on the list, we'll notify you when doors open.' That way you still have a warm lead. And when you do open again, you can send a targeted blast to that waitlist. Luna: So you're basically turning a potential subscriber into a more engaged subscriber before they even get the first email. Lucas: Exactly. The waitlist itself becomes a filter. People who join a waitlist are more likely to open and click once they're in, because they've already demonstrated intent. It's self-selection for quality. Luna: One risk I see: if you're a new brand with no audience, scarcity just means silence. You need some volume to build momentum. Lucas: That's fair. Scarcity works best once you have a baseline of a few thousand engaged subscribers. Before that, you should focus on creating great content and growing organically. But even early on, you can apply the principle in small ways. For example, instead of offering a generic ebook download for every signup, offer a limited-time bonus. 'Sign up in the next 48 hours and get our exclusive checklist.' Luna: That's more about urgency than scarcity, but related. Both play on the fear of missing out. Lucas: Right. And the research backs it up. A study from the Journal of Marketing Research found that scarcity cues — like 'limited supply' or 'limited time' — increase the perceived value of an offer by up to 50 percent. That applies to email subscriptions too. Luna: So the bottom line: if your email list is huge but your open rates are below 20 percent, you might be sitting on a liability, not an asset. Shrinking it could actually make you more money. Lucas: Exactly. And the best part is, you don't have to be drastic. Start with a one-month experiment. Remove everyone who hasn't engaged in six months. See what happens to your metrics. If revenue drops, you can always import them back. Most email service providers keep a record. Luna: It's like a garden. You have to prune the dead leaves to let the healthy ones grow. Lucas: And that's really the heart of this strategy. It's not about being elitist. It's about respecting your subscribers' attention. When you send fewer emails to fewer people, each one matters more. Luna: Speaking of respecting attention, this conversation reminds me of why we keep this podcast ad-free and focused on actionable content. If you find these marketing discussions spark something you've actually used in your work, and you want to support keeping it that way, you can help us out at buymeacoffee.com/fexingo. Lucas: Yeah, that support really does allow us to stay independent and avoid selling ad slots that would interrupt the flow. It's a small gesture that makes a big difference for us. Luna: And it keeps the conversation honest. So if you've ever gotten a tip from this show that saved you time or money, consider it. And now, back to scarcity — let's talk about how to measure the impact. Lucas: Good. Because if you're going to shrink your list, you need to track the right metrics. Don't just look at total subscribers. Look at active subscriber value — the revenue per engaged subscriber. That's the number that matters. Luna: And also monitor unsubscribe rates during the re-engagement phase. If too many people opt out, you might be too aggressive. Lucas: Right. A healthy re-engagement campaign should have a conversion rate of 5 to 10 percent — meaning that many people click to stay. If it's lower, your content might not be compelling enough. If it's higher, you might have too many people who are just clicking to avoid being deleted, not because they actually want your emails. Luna: So there's a sweet spot. The goal is to end up with a list of people who genuinely want to hear from you. Lucas: Exactly. And once you have that, you can focus on deepening the relationship rather than constantly chasing new subscribers. That's where the real long-term value is. Luna: Alright, so to wrap up: scarcity isn't for everyone, but if you try it, start small, measure everything, and be prepared to see your list shrink but your revenue grow. Lucas: And remember, the goal isn't a big list. It's a list that works. Sometimes less really is more.