I sell on Overstock and eBay as well. I sell far more on eBay than Overstock. BUT Overstock is making some aggressive changes and are making more in the near future that are going to impact their auctions significantly.
They have added a very aggressive and forward thinking Auctions director. He is highly involved on the forums and is implementing changes. My personal opinion is their Auction site is going to move back into the foreground again. There is a lot more activity than several months ago.