Seriously, ask $1K, close it, get the cash, and be onto the next project, lol, this is the most longest painful sedo negotiation I have ever seen.
Unless you got bank, and time, don't mess around with sedo offers, if you got little invested in it, and have an asking price of 1288, make the seller feel good, and you will get close to what you asked so win win, wrap it up, and move on.
Sedo auctions are not what they used to be for brandables, only short terms, or generics do well in auctions...
Sometimes buyer can be turned off by waiting out an auction, only to see it sell at the same price, knowing no one else wanted it, and might not follow thru, has happend to me, so your risk is your reward. For sales less than $10K you really don't have much recourse if the buyer does not follow thru.