Here's what often happens. A nice bike or frame with a cult following comes up for sale on eBay. Bike geeks start posting messages on forums about the sweet RB1/Merckx/Colnago/Pinarello or whatever for sale on eBay. Pretty soon there are a bunch of enthusiasts following the auction and trying to outbid each other.

I absolutely hate it when "well meaning" cyclists post messages about sweet frames on eBay. I've seen the prices on frames driven up to ridiculous prices that way.