how do people make money?

Wouldn’t happen here. Unless it’s a YELLOW approved plastic container for diesel or red for gas the filling station won’t fill it for you. That’s why I use the card lock in town
I have had an attendant/monkey at Sam's refuse to let me use an obvious fuel container to put fuel in.
So I went to my other really cheap station in town, that doesnt care if you use a drink container from McDonald's, bought $180 of diesel/91, and showed the receipt to Sam's, said "this is the sale you lost this time, and every time, from now on."
Card lock???