Sgt_Kickaxe - 3:16 am on Oct 18, 2013 (gmt 0)
Ebay's partner network(EPN) affiliate program implemented a drastic reduction in cookie length for affiliates on Oct 1st, 2013. The new cookie length is 24 hours even on 7-10 day auctions and since buyers often like to wait until the last minute to bid the affiliates are out in the cold. Ebay's partner network blog and affiliate forums have erupted in negative comments since then.
Perhaps the increase in their take from their own affiliates is to offset this stock loss? Either way, losing a lot of affiliates has to hurt. The market seems strong outside of ebay, ad spending is up too.