"I would never sell anything unless I was 100% confident on my ability to follow through on the deal."
"For PoP; not sure yet, haven't platinumed it ever and don't know how long/how hard it would be"
I think this is what bothers them. The fact you think you can be 100% confident in your ability to follow through on a deal for a game you have never platinumed and dont even know how long/hard it would be. I think you see how that makes no sense. :p
Altho its not uncommon for trophy traders to sell games they haven't got a plat for themself (Heck, half the deals I've done, I dont even have that plat for myself), the majority of us atleast have played the game and have a basic understanding of how to achieve the plat.
Also, this welcome is pretty much one of the nicer welcomes into this section lol, when I started back in February, half the shops being made received heavy criticism, and rightly so as we're dealing with peoples money and hard-earned income, so you have to be tested and made clear on the no-nonsense approach we have here.
Apart from that, You handled it brilliantly, unlike some people who will respond to the criticism by swearing/insulting/flaming everyone. So already you passed the trophy traders first test. Now all you need to do is get a few trophy trades on your referral list, and you'll fit right in.