Most forums like this have a feedback thread or a direct feedback you leave on a persons profile do they not? Hell there are even sites where you can post all the buy/sell transactions you've made online and send it to the potential buyer to show your history.
Again, you guys sound like sheltered middle aged, middle class white people. The whole world doesn't work that way. Somehow this guy doesn't take basic precautions when dealing with random people on the internet and I'm the asshole for pointing it out?
Hey I have 0 feedback and my name is Joe Bileau from quebec, send me your money and I will ship you 2000 mint paulsons th&c for $800. Look, I even have a picture of them! It's super legit guys, you can trust me!