Since it only gets 25 global exacts per month, it is not really a keyword / generic name.
As a brandable, it has some mild potential.
But, it would be more appealing to the brand-building buyer if it was ArtBids, BidArt, or even ArtBidder.
The most perfect use for ArtBidding is an instructional site for teaching people how to bid on art.
Sounds like a very small market and not much cash to come.
If anyone makes an offer, I would take it quickly.