The online course market has a paradox at its centre. The most common instinct — to cover more topics to appeal to more people — consistently produces the courses that sell least. The courses that dominate their categories do the opposite: they narrow down to a specific person with a specific problem and promise a specific outcome.

When a buyer encounters a course title, they are performing a rapid assessment: is this for someone in my exact situation? A course called "Marketing Fundamentals" could be for anyone. A course called "Email Marketing for Independent Personal Trainers: How to Fill Your Client Roster Without Social Media" is for one person — and that person, encountering it, stops immediately.

The specificity is itself a trust signal. It communicates that the creator understands the specific context deeply enough to address it separately. The trainer who has built their own client roster through email, who understands the specific objections and circumstances of that audience, is a credible guide for that audience.

The market size objection — "but isn't a narrow niche too small?" — is consistently disproved by sales data. A course for independent personal trainers appears to have a small audience. But there are approximately 300,000 personal trainers in the US alone, the majority operating independently, and most of them struggling with exactly the marketing problem the course addresses.

The narrow course, priced at $297, sold to one percent of that audience, generates nearly $900,000 in revenue. The broad marketing course, competing against every other marketing course ever made, rarely approaches those numbers.

A narrow course is also easier to build. The curriculum for "email marketing for personal trainers" is specific enough to write without generalities. Every example is relevant. Every case study is real. Every objection is one the audience has actually had.

Courses in specific niches benefit from open-loop marketing. A landing page headline like "The one thing every personal trainer's welcome sequence gets wrong" creates a gap the reader needs to close. The specificity ensures that only the right person feels the gap — intensely.

The profitable online course is almost always the specific one. The one that says something that makes one specific person feel: this was made for me. That feeling is the conversion engine.