“Fishing hobby people spend thousands tens of thousands of dollars on boats and trips and other stuff so if you're a solo developer looking to make a living right now go find a niche one where people are gonna find it valuable enough to spend money.”

Hobby Niches Where People Already Spend Thousands Are Gold for Indie App Revenue

The fishing analogy is instructive: people who spend $30K on a boat will not blink at a $50/year app subscription. The same applies to golf, hunting, woodworking, homebrewing, sailing, and dozens of other hobbies with dedicated spending. Evaluating a niche means looking not just at user count but at existing offline spend — a community that spends big offline will spend proportionally on a great digital tool.