You post things up, and have people bid on it with the credits they have. After the listing ends, and you ship them their stuff, you get the credits they give you. Woth those credits, you can get stuff you want.
Long story short, it's just like you're trading stuff.
Sure.. But I'm not liable if anything happens to the money. If it gets lost in the mail, stolen, etc. You have to send me the money again for me to ship it to you.
Uhm.. You can send meconcealed cash in the mail, but then it'dtake longer for me to recieve the money, then send the case out. Also, I'm not liable if I don't recieve the money in the mail.