It's not so much don't sell gas as "don't lower your price below x". If enough gas stations comply, you won't have an option less than x. But it would seem to make the returns from not complying higher, as you would get all of the business.

The problem with housing is that the sellers' supply is limited, those that don't go along with the minimum pricing scheme quickly go to 100% occupancy.

No, I mean if you did exactly what I stated with gas prices you would be punished under existing gouging laws in most states.