What if a gas station finds that people keep fueling up and then driving off -- the customers don't seem to want to plaster their cars with bumper stickers related to the advertisers who are paying extra to the gas station and they don't seem to want to use the fuel "filter" that requires you to put a small extra charge on your credit card every few miles or the fuel won't move from the tank to the engine?

For the sake of profitability, I could imagine the gas station might choose to stop selling gas through pumps since those simply couldn't be as profitable.