What about the people who are starting out and trying to get trade rating. Not saying people with 0 trading are trustable but some are so that's kinda biased.
Well... that's what the trader rating system is for. The entire point is to make you more confident dealing with someone who has a solid, positive rating. I mean, in your position, suppose two people offer you the same gun for the same price. One has no trading history, and the other has 12 good transactions to his name. Which will you choose? Seems like a pretty obvious choice... it's just common sense =)