I'd say one thing for you: watch out for sellers with 0 feedbacks. Specially for expensive items.
Lot's of scams going on these days on Ebay.
Don't you think that it is at least a little bit odd that a magazine from 2 years later is worth over 3 times your current bid for example:
http://cgi.ebay.com/Playboy-October-...QQcmdZViewItem