If the "BUYER" uses fraudulant means to pay for your gift card, and Amazon processes the claim, they can and will cancel your gift card WELL after you've released escrow. They will remove the credit from your account, and if you have no gift-card balance, they will charge your credit-card on file. At this time (August 2014) Purse.io has no protection against this type of event, and no remedy in place to return your coin.
$(*#&^@$(*^$*& This just happened to me. I sold two cards on Ebay and one of the buyers informed me Amazon had canceled it. I was skeptical (Ebay is full of scammers who claim this), but upon logging into my own account on Amazon I found they had zeroed out my own gift card balance!!! That included portions of 4 other gift cards, all obtained via Purse (from different buyers at Purse too, so far as I know).
I'm following up with Amazon now in hopes of some kind of resoluton but seeing that others are experiencing this, it doesn't look good. I do have a problem with Amazon canceling gift cards weeks or months after purchase (And note that they didn't even bother with a notification email or anything, they did it on Aug. 27). It's one thing to have an anti-fraud program in place to prevent fraudulent purchases, but then playing games with card funds after the fact winds up catching all kinds of innocent victims like myself and my Ebay buyers instead. (NOTE: I _will_ give refunds to my Ebay buyers if things pan out as I expect - they are innocent like myself and shouldn't be caught in this crap Amazon is dishing out. I'll just take the hit myself I guess. But Amazon is going to get an earful. If they'd just accept BTC this wouldn't be happening.)
Shame on Purse for not being more pro-active about this situation. What's especially damning is one of the Purse operators gave me a cryptic warning not to buy gift cards on their site a while back, but when I pressed them for an explanation they didn't divulge this problem. Nor have they posted about the issue on their site. Looks like I'm going to be out ~$1000. If it looks too good to be true....