Playerauctions is pretty shit and the only other site I know of shutdown. MMObugs is about as close as it gets to no hassle, I even got kicked off the market one time just for suspicion of mischief. They don't mess around.
Problem with PA is any asshat can use a VPN to register an account even if they're banned, phony email etc. Then sell you crap for hundreds or thousands of dollars that they can still legally take back with no repercussions.