I've noticed a lot of feedback threads and scammer posts here on GT. While these are helpful and can get the word out about deals gone bad, I think this system could help GT a lot. I have used it on another forum I frequent a lot, and while it isn't always 100% accurate, it is a very good tool to guage the person you're trading with.
Here is the VB link to the system. http://www.vbulletin.org/forum/showthread.php?t=52188
You can see it in action at ModMyMoto.com
Basically every time a deal is completed the users have the option to leave an ebay style feedback for each other, and also a +1,0,-1 rating. These tallies are then displayed next to the av for that person.
Dont know if this has been brought up before, but might be something for the admins to look into here.
Thanks for the great forums, and have a good one.