SternWhats a hobby/craft that you wouldn't expect that has an incredibly high ceiling either monetarily or in sheer skill?
ThrowawayModel trains. Sure, you can have a lot of fun with a 100 dollar toy train, but those brass engines are very shiny and very expensive.
Seen a couple basement setups in my time though tbh never saw an especially impressive one. Most tend to just emulate rural routes and small towns. Always thought more fanastic scenery (Surely there has to be at least one person out there who does D&D figure stuff and trains.) would be great, but I suppose that it would detract from the star of the show.
Surpringly not, no model train manufacturer does fantasy stuff. Best you can get is custom stuff.