Competition helps;
Places where the service is best usually have competition;
For example; YBAF.
AIR BP is the new kid on the block. before that, asking for fuel from Shell and Mobil was a cap in hand affair. Please Sir, may I have some more.
Old Ray @ BP is there in a flash and even carrys bags, and has a good collection of dirty jokes on hand.
Flight facilities @ CG is another example - their service is quick and efficient.
Monopolies breed complacency. I now avoid EN as the same guy controls all brands and the service is lousy.