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.
From my understanding it's also expensive as hell.
As an alternative, the game Moonbreakers has a really impressive model painting tool. You paint your figures that you play the game with (though there are defaults you can choose from also). It's an under-appreciated game with top tier voice-acting also. The story is told in audio form you can play whenever in the game, so you can just chill out painting while listening to the game's story too.