The KPI That Reveals Whether Your Email List Has Buyers or Just Readers

  • August 20, 2026
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Your open rates look fine, your list is growing so why isn’t revenue following? In this episode, you’ll learn about the metric that tells you whether your email list is actually profitable — revenue per subscriber — and you’ll learn through a real example of a course creator with 16,000 subscribers who discovered his list had doubled in size while his results stayed flat. If you’ve ever wondered whether you’re building an audience of buyers or just readers, this episode will show you how to find out.

What You’ll Learn in This Episode

  • Why open rate, click rate, and list size can all look fine while revenue stalls
  • What revenue per subscriber is and how to calculate it in under a minute
  • The real story behind a 16K list that doubled in size but didn’t double in revenue
  • Why not all traffic sources are equal — and what that means for how you build your list
  • How a mismatch between your audience and your offer shows up in your numbers before it shows up anywhere else
  • Why a 30K list can outperform a 200K list — and what that tells you about list quality vs. list size

Resources:

  • Take the free Email Bottleneck Assessment → https://www.monicabadiu.com/email-revenue-self-assessment/ 
  • Find Monica on LinkedIn → https://www.linkedin.com/in/monicabadiu/
  • Find Monica on Instagram → https://www.instagram.com/itsmonicabadiu/

Hi. And welcome.
My name is Monica Badiu. I am a marketing consultant turned conversion copywriter and copy coach. I help online course creators and info product businesses sell more through persuasive, non-spammy, no fluff copywriting.

I teach about copywriting, digital marketing, and conversion strategies tested in my businesses and with my clients. 

Other links:


Master the Inbox is hosted by Monica Badiu, an email revenue strategist and conversion copywriter who helps course creators turn their email lists into reliable revenue systems.

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