Yeah, came here to post something similar. I used to hang around in real estate circles, and two businesses come up often: Self storage and car wash. These are two things people just can't get enough of.
(Car wash usage doesn't go down even during a recession, apparently).
I think I may have an autistic affinity for washing machines, but I would LOVE to own a laundromat. I feel like this would fit into the self storage/ car wash category.
Ha, I watched some guy on Youtube who bought a carwash. It's seems like a decent way to basically make some money with not a ton of work. Plus, you can get a lot of money as cash too, makes it easy to not report as income, which I bet a lot of their owners do.
I personally don't get car washes. I just wait for it to rain. Then free car wash...