I signed up for this site. Do you guys use it? Also, how does it work? I would like to buy some frags or even trade some. Could someone give me a quick overview on how to use it?
I haven't used it in a while, but basically I've only used it to search for frags I've wanted to buy, after which I contacted the seller. My transactions all went smoothly; it's pretty much a consolidated marketplace for people to advertise their frags. I haven't used it to post items for sale though, so can't help you there.
This depends on the seller. The seller decides how much to charge for shipping (if any), usually depending on weight and distance. Frags.org doesn't do any selling. They don't set prices or policies; they're just a platform for people to sell their frags.