Granted, the world's not perfect, but eBay does a fantastic job, considering. They may not get all the the disputes settled, but personally, i was screwed by a guy once, and actually got the guy in serious trouble in with his local law enforcement (he tried to gypp some other folks at the same time too) but i got all my money back (actually twice, b/c he refunded me, and so did eBay), so i'm rather happy with the security of eBay.