Several things are going on. As others said, eBay and PayPal fees have gone way up. I sold a bunch of parts in late summer, early fall and was shocked at how much they ended up billing my PayPal account. The recession has also had a big impact. Since frames and parts aren't generally fetching as much money as they did a few years ago, a lot of people aren't selling parts on eBay because it's not worth what they're getting, particularly after fees. If you've got an Eddy Merckx frame sitting in your garage that would have easily sold for $800 a few years ago, it's hard putting it up for auction on eBay when it might only sell for half that amount -- and then the fees skim 10-15% off that amount.

What surprised me about my recent eBay sales was how random the final prices were. Vintage parts sold for more than I expected but some very nice stuff sold for prices that were hardly worth the effort to pack and ship them. The biggest surprise was some old cage pedals with toe clips that I almost threw away. I cleaned them up but they didn't turn well and needed new bearings and grease, which I clearly described in my ad, but they still sold for $30 plus shipping. Another set of Look pedals in excellent condition sold for something like $5, and they were much better pedals.

BTW, I still think eBay is usually better than Craigslist. Everyone is just looking for extreme bargains on Craigslist. It's like the world's biggest garage sale. Whenever I sell something on Craigslist, the callers try to talk me down on the price, even if it's a bargain. Even if they agree to buy something, they will show up and try to get it for less when picking up the item. However, I still use Craigslist for stuff that is too big a hassle to pack and ship.