I was following this auction, and surprised to see it hit over $3600.
For me it was the appeal the Nurnberger bow(s). Nurnberger bows can be found selling between $2000 - $6000+
Even if the bows were warped and no hair, they could be easily re-haired and the bow rechambered.
The great thing about Goodwill site, is that the items can be returned. If the bows did have broken tips and the violin did have a saddle crack vs 'scratch' you'd likely be out the return cost.
Return Policy: Returns will not be accepted without prior authorization from the Seller. Items may be returned within five (5) days of receipt if the merchandise was damaged during shipping or if there was a significant misrepresentation in the description. PLEASE NOTE THAT WE DO NOT REFUND SHIPPING AND HANDLING CHARGES AND REQUEST THAT THE REFUNDED ITEM BE RETURNED TO SELLER PRIOR TO REFUND PROCESSING.
However, you could likely flip the violin bows and turn a profit as well as have a lovely looking single piece back violin.
By the way, what are other similar sites which violins are auctioned? Searching for 'violin auctions' did not return 'shopgoodwill' so I'm certain there are unique sites that auction violins.