No matter your trust one should always use escrow.
Also you have a slim chance of selling at 1:1 but they will get swooped up at 10% off
I am not in any rush. A lot of the people selling for a discount do not have a solid reputation. I prefer p2p trades because building actual trust networks and trade partners is important. Additionally escrow does not protect you from fraudulently obtained cards anyway. I have over 3 years of rep and way more value fronted to me with all obligations met as agreed. I am willing to bet that means more for some people than 10% off.