Whats a hobby/craft that you wouldn't expect that has an incredibly high ceiling either monetarily or in sheer skill?
For example, I'm sure the average joe doesn't know just how expensive calligraphy pens can be, or how deep the rabbit hole goes on video game speedruns.
Why would you not expect that to have a high ceiling either monetarily or in sheer skill? I mean bikes are expensive, and it's a sport practiced on a professional level.
Because you can get a basic bike for like a couple of hundred quid and commute for years. It's just a basic transport type. Yet it grew into quite an absurd, dangerous and expensive hobby.
I think it's a question of how high the ceiling can go. There are people who helicopter to the tops of mountains to drop into a downhill, and their ridiculously expensive bike will need many parts replaced at the end of it.