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.
I feel like games workshop table top games(e.g. Warhammer 40k) would fit in to this description if an individual had never heard of table top wargaming, or their reputation.
They're made of plastic? It can't cost that much right!?!?
but the rules, they can't be too complicated? It's just game !?!?