I think there are a couple of threads talking about that particular sale, maybe in the "great finds" forum ... I would check them out before jumping in on that one personally ...
Ditto Gerk.
-Collectable value? Hmmmm doubtful....don't buy it based on that.
-No one has been able to get a response form either of the 2 Datahand sellers on ebay right now. I contacted both with no response as well. They have been lowering their prices.
-The units are obsolete, and you may not be able to have them work on your system (if that's what you want to do), that is assuming they work in the first place.
-One of the auctions is for a unit that is obviously incomplete.
Both of these auctions have popped on after several pristine, new model Datahands came onto ebay (auctions by end users) and had sold for higher than new prices. I personally believe that fueled the placing of these auctions (by ebay resellers, not end users) for the obsolete, incomplete, units asking for the same high prices.
Be careful and have no expectations. Be prepared to go to Datahand to try and buy parts to make the unit work. If you decide to buy, share your info here on Geekhack please!
Interesting that the one auction you say was offered about $250 and turned it down. That's probably the most he can possibly get, and I believe that even that is too much for that unit.