You're missing the point. Most people don't think through this. They stop at "That costs me $15. Not gonna do it."
And yeah people do part with $15 on known entities in brainless ways. This is a new behavior though. This gas refueling scheme ain't gonna make sense to the vast majority of people, hence once again cue the Dana Carvey George Bush skit...."Not gonna do it."
Much fewer people will pay $15 to avoid 40 minutes of driving or waiting.