I have seen many an item that I have bid on (but did not win) come back for sale a few months later... There are a couple items up for sale right now in MD that I was second highest on four months ago that I would be bidding on again except that I purchased some similar units (but not quite as nice) in sale 3577 (the sale that took forever to get the EUC's past GL and on to Battle Creek...).
And yep, if you get the "you were the high bidder" email and have an EUC requred, you don't have many days to get the paperwork submitted...