Because they are opportunists preying on the unsuspecting public?

That said, you would have to be a complete numpty to place a bid on that after typing Nokia n9 in the search field and skipping over all of these http://www.ebay.com/sch/i.html?_trks...9&_sacat=0

Edit: link does not appear to be working? That should show the list of Nokia n9s for sale on ebay. Hmmmm?