Just out of curiosity and as a potential customer:
* Where does the discount come from i.e. how is it profitable for you to make these deals?
* Are you using stolen cards to make the purchases?
* Also, are you willing to use escrow for the first purchases to build up trust?
* Finally who made these purchases that you are posting? Can you give the usernames of the people as a proof?
* I am sure he isn't going to answer all your questions because of trade secret protection. but i can assure you it is feasible because the discount comes from him using a gift card which he/she purchases at a much cheaper rate. this is the best i can tell you because i do this myself... though i don't offer the service but i made all my Amazon.com purchases at a much lower rate using this style. i am not saying he/she is genuine, just trying to tell you what i know and i do. cheers.