Did you "merge" the sellers cards into your "legit" card? NEVER do that. They will close any card that has any (cough)cheap(cough) cards attached to that they find suspect and you also lose you "real" funds. They can easily follow the transfer of cards and per their terms of service regarding gift cards you are SOL. That's the chance you take by buying this stuff. Win some, lose some.
I merged one $50 card from here onto my real account which had $10 or so. used it for like 10 days. Did not experience any issues at all. Maybe I just got lucky.
Maybe you don't understand. I am Not referring to ADDING ANOTHER CARD TO AN ACCOUNT (that's not merging, that's adding). I am referring to merging TWO CARDS together to make 1 single card. That is a disaster waiting to happen if ONE of the cards is bad. Happened to me about a year ago when I bought my first "discount" card and I lost $290 of REAL money on my gold card (and the card too) by adding a $25 "e-gift" from Raise.com that I paid $22 for. Raise refunded my $22 but I was out $290 in real cards from family. My ACCOUNT was fine, it was the combined card that was lost. You can move the funds around 100 times and they can track it and close the card it finally ends up on.
Many sellers think that because the buy 4 x $25 "real" cards in a store with one of these "obviously questionable" $100 e-gifts cards then resell the 4 x $25 "real" cards they got in a store protects them from closing it. That's a big NOT. If one goes they all fall like a house of cards. That's why "receipts" are meaningless unless paid for by cash.
If you merged 2 cards together into one and got away with it, yes, you were lucky. They don't all go bad but why take the chance of losing both? Just leave the separate cards in your account.
I am sure you aren't naive enough to think ANY card sold on these forums are truly legit. I have bought and used many. I've won many and lost some.
It's also strange that 2/3rds of the "vouches" in this thread are from newbies with 1-5 total messages.