Why would they do that? There's no money in selling gas. Gas stations make all their money now selling food in the convenience store. The gas pumps are just a way to get you into the store. And they're moving upmarket, making custom sandwiches and hot meals, selling fresh fruit bowls, etc.

I've seen those in the US but they're very uncommon. I assume the store pays for itself and it's considered a positive feature of the gas station by many motorists.