That same model sold for $600 on Ebay in February. It had a case and two shafts, it was in rough shape if I remember correctly.
There was only one bidder so it seemed fishy to me. The cue you have looks to be in very good shape.
I think $500 to $700 is the high side on a straight auction- not saying you cannot get $500 or more - but that is the upper side - if I were selling on this site I would ask $650 and take my highest offer- my best guess is $500 or so is the upper limit on this cue in excellent condition with 2 shafts as mentioned above. You found a cue, so it is all profit from there, eBay will cost you about 15% on fees by the time you are done - taking $500 here would be a good deal on a cue found in a closet. Straightness and condition matter- alot!