It's not just on these forums - take a glance at youtube at the "iPhone 5S unboxings" that have the site has been flooded with. So many of the users talk about "I may return it in a few days" and so on.
I believe the problem is that it has conditioned people to not really think about a purchase before they make it. They know if they get buyers remose, or finish up a school paper, they can just get a refund. I believe it is more widespread than most believe.
Apple has had the best customer service os any company that I have dealt with and I really appreciate that. I pay a premium for the products for that experience. But I do believe that people need to exercise a certain level of control and consideration. If they are not 95% they will keep a product, they need to do themselves and Apple favor and save their money.
My signature is a result of so many people returning items for petty things. I read so much about "lag" and other things that many people are way oversensitive to or could experience the product in the store and discover many things. People returned so many MacBook Pros with Retina Display - I have seen cases where people go through seven or eight of them.
I don't know how this hits Apple's bottom line - I am sure they will deal with it if it is significant enough. Best Buy has already adjusted their policy to reflect excessive returns and renting items. I just expect that the people that rent things will started shopping at Apple directly, and they may be forced to do something.
I am not directing this at the OP - just an observation in general.