Well, I think I am well known for my ebay bottom feeding, and have noticed (and posted about) this many times too. However, in my case, the I get the deals I do because I am not "shopping" for items in the normal way. I sometimes get items at what has to be far below cost to produce. I have found that some vendors blow some items out simply to get positive feedback points. That's amazing to me, but hey, I am willing to give good review for a great deal, no problem!
I tend to end up with stretches of time I need to kill, so it's not a problem (and somewhat zenlike) to troll thousands of auctions looking for the un-noticed gems among the gravel. Yesterday I got a tube of TWENTY 40-pin AVR's (4414's) from a vendor in Colorado for seven dollars, it's another seven to ship. Uncommon to get deals like that domestically, but in this case, I think the outfit is a clearinghouse for components bulk-purchased from defunct businesses.