NumismaticsFTW, a perusal of a potential buyer's posting history should allow you to decide if a buyer is serious. I've bought from other forum members with never a problem. Also, it's the buyer that is at greater risk because payment is required up front. Additionally, avoiding paying a 3rd party 10% or more (the bay, for instance) allows for better deals on both sides.
Inordinately fascinated by bits of metal with strange markings and figures