There are many different asphalt mix designs, ie temp asphalt, pg6410, pg7010, HRMA (rubber mixed) and so on and so on. The asphalt actually has different aggregates, binding agents and hardeners that are petrol based and depending where you live have better quality or worse materials. Like you said, why don't gas stations have deteriorated asphalt by the pumps, that is because they use a quality asphalt mix design so it doesn't deteriorate. Obviously some clubs are using the cheapest way to put a runway or pit area in.