My aunt and uncle used to own one in Texas. It was a combination gas station/ minimart type of thing with a fast food chicken restaurant inside.
Maybe other people's experiences will be better, but they ended up losing a lot of money on that place. It just didn't do the kind of business they were expecting. And then when they wanted to sell it, they had a hard time finding someone who wanted to buy it. By the time they did sell it, they didn't even care anymore how much they got for it. They just wanted out.
I know they had a problem with the workers they hired too. They were dishonest and stole from them. Not all of them, but there were a couple.
There was always some kind of problem, with a machine not working, or an employee problem, or a delivery problem, etc.
So they were always, always there. Never at home. Never got a break.
Like I said, maybe others will have a more positive experience, but it was a complete nightmare for my aunt and uncle.