This is a big part of it. They make a lot of edge on the liability and disability waiver (many credit cards come with this benefit already) and fuel pre-purchas

This is a big part of it. They make a lot of edge on the liability and disability waiver (many credit cards come with this benefit already) and fuel pre-purchasing (pay for a full tank, even if you use an eighth of it). Given that many folks who line up at the counter are first-time or infrequent travelers, it's enough of a pull to keep them open.