For the same reason that the Vegas attraction “dig a bunch of holes with industrial diggers” was so popular: people want to do jobs they think are cool without years of training cost up front, and this is a way for them to do so.

Farming simulator and Car mechanic simulator are both in my todo list, because those are hobbies I’m truly interested in pursuing and I’d like to know what it’s like to do them as a sim first. Most other live sims like this are deeply uninteresting to me, even if they have lovely visuals. Meanwhile I’ve seriously considered buying a Renesas SH-2A simulator for nearly $3k so that I can develop better car software!

Is there some job you’ve always wanted to do that requires extensive training that you can’t / won’t complete at this time? That would be a use case for sims that’s less game and more hobby for you (but that’s always a blurry line for all of us so don’t take that as criticism).