Way to steal people's ideas and post them on other forums as your own creations. Funny how you didn't get this until you saw it on YF, isn't it?
Signed Trading is the only way to be sure you don't get ripped, but it can be expensive. However, References and Middleman trades are very effective. I've been on two or three forums using them, and whilst I have been ripped on all of them, it was only once or twice, and it has worked for me too. I have had people send first and their cards never appear. Middleman trades are the most effective, but you need to have people with 20+ refs doing it. If you're not trusting someone in a trade, why someone who will get twice what the other person will get?
YJ