As someone stated earlier, if you buy a defective product from a local retailer, you return the product, then you get the refund.  You don't come in, have the store give you money, then go home and get the product.  I work retail, and we get people like this sometimes.  "You guys sold me a broken DVD player, i live 20 miles away, you guys need to come get it, i'm not coming back to the store blah, blah"  Just ridiculous.  Sellers will be glad to help out a disgruntled buyer, but sometimes buyers just act unreasonable.  
One point that i see yet to have mentioned, is how can OC trust SNAAAKE.  If he would have sent him the 1.5 PSP, who's to say SNAAAKE wouldn't have just kept them both?  I know he wouldn't have, just like I know OC wouldn't have kept both, but I can definately see OC's side in this.   I sure wouldn't have sent the guy 2 PSPs w/o getting the first one back.  The only thing OC should have done was offer to cover the return shipping, since it was his initial mess up, that's it.   Of course i certainly wouldn't do it now after this behavior.