What business does not have a cost to acquire a new customer? Part of that cost to acquire a new customers is commonly "spent" by forgoing or rebating a portion of that new customer's revenue (if they paid full price) in the hopes that they will like the service and remain a full paying member. What difference does it make if Good Sam spends $100 marketing to that customers or spends $25 marketing and gives them $75 in "perks?" There are so many companies and industries that do this that I am surprised to even see it raised as an issue here.