As with most corporations and industry, there is the basic "this is what you are getting because you pay x amount of $$", then there is the stuff on top that you have no legal right to, that you are guarenteed none of, that you do get because the entity is trying to build a relationship with you because it knows that its cheaper to keep you as a customer than win you over again. But when it boils right down to it, and you start believing you are entitled to the stuff "on top", the entity has the written agreement of what you are actually entitled to in order to remind you that you are actually entitled to very little.