I feel like Amazon really wouldn't like its users to do this though... it means they're losing money. I almost feel as though doing this too often will cause Amazon to somehow suspend your account. I haven't ever returned anything to Amazon though, so I really can't say if this is the case.
1) I've bought (and not returned) so much from Amazon that they get more than enough from me, probably more than 99.9% of their customers. They would never ban your buyer account, they want your money, and returns are fully within their policy. They pride themselves on customer service, remember
2) I couldn't give a rat's ass what Amazon likes considering they banned my seller account with 100% positive feedback and are holding $4000 funds for no reason.