I've seen WBSTS's return policy. It's a very, very good policy.... mine is based off of it.
The other thing that a good return policy can do is to stop returns. I had a buyer complain about a laptop that wouldn't run his game (It wasn't a gaming laptop by any stretch of the imagination). He sent me a message complaining about it. I quoted the terms of the policy and the specs in the listing, basically saying that he had no recourse. He never did anything at all.
Your TOS and return policy can be one of the largest money savers in your store. Read them over and over, and make sure they're watertight. They'll keep your ship afloat
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