Hi.
I'm one of the staff members at HexPay.org, and we have recently been notified about a scammer who has scammed a lot of users from this forum.
It's not just this guy. It's many. In fact, I'd say the overwhelming majority of users on this forum who use such autobuy link sites as yours are selling either hacked or non-existent stuff. It's become rife in the Digital Goods/Invites sections.