A scrapyard, though, that is primarily scrapped vehicles. The good news is it normally isn't that smelly, the bad news is, the junk is mostly just old cars and scrap metal, not fun, interesting stuff. You have to remove the parts and sell them, either to people who need used parts or for scrap metal.
I really don't think I'd mind the dirt and stuff, I'd just have to be managing people because I'm probably not big and strong enough, nor skilled enough to be very efficient at part removal. Chances are I wouldn't be able to pay workers well and still break even, so I'd have trouble finding reliable help with the necessary skills. That would be a pain. Somebody would have to have a CDL with whatever necessary certifications for running the wrecker and maybe for hauling scrap. I'd have to have security to keep people from doing their own salvage operations at my place when I was gone for the night. Heck, if they got hurt trying to rob me blind, I'd probably be liable for damages. I'd have the EPA, OSHA, the city, state, and county to keep happy. Still politics, but with real politicians. Then all the tax stuff.
Too much of the same stupidity you deal with working for somebody else, with more risk and less money . . . If the money came out even it might be worth it just because you are going to be mostly dealing with XSTPs and they tend not to be illogical and concerned about stupid things, but for less money, I'd rather take the money, live as cheaply as my career allowed, and retire early.
But maybe that's because I'm more familiar with the blue collar sector and small business than I am with corporate crap. The scrapyard is closer to the devil I know and the other is more the devil I don't know.