There's one thing that you didn't mention which was the risk of purchasing a card that was initially bought with a stolen credit card.
That's the risk I think that is most important to realize when you're transacting with any kind of gift card - that you are trusting the seller to be providing you with a legitimately purchased card. Even escrow won't be able to protect you from a fraudulent gift card.
You may be able to spend the GC and redeem it, sure, but you may be in trouble with law enforcement given that the goods are shipped to your address.
--snip--
What IF:- A buyer's intentions aren't too good and he's gonna buy it with someone else's Amazon account? (You know you can get an Amazon account with anyone's credentials for some bucks in dark markets, and even free sometimes)
- A buyer uses a different location (VPN) to protect himself from being traced
- Last but not the least, a buyer gives a fake address or an address of any of his relatives, friends, ENEMIES, or a postal address where he could fake out his identity and get the product through that gift card?
There's a lot I've got in my mind to ask, but please clarify these first.