Unfortunately those 1st (or 2nd) generation steel or aluminum lugged carbon fiber frames have taken a beating on the used market.

With only a few exceptions, the value of the bikes don't come in any higher than the equivalent steel or aluminum framed bikes from that era.

And, there are a lot of steel/aluminum lugged Trek, Specialized, and Giant bikes out there.

Nonetheless, $300 isn't a bad deal for that bike.