I've been watching ebay for carbon bikes, and they have poor resale value. I just saw a $2500 2004 frame go by for 1300. And even though I'm looking at buying the lower priced frame from the same company (Kuota) I couldn't bring myself to bid on it. It was my size and it was somewhat local so I could have checked it out before committing.

Some brands do better than others, like the popular ones, Trek, Giant. But the more exotic stuff doesn't do well at all on ebay. I think though that the original premise is true, people are afraid to buy it. Like in the fork example, he couldn't be selling the Kuota to get something lighter, there are only a handful that are, 1080g or so. I guess he went for that Nag that he always wanted.