I was a little surprised it went for so much, but it did look well loved.
Yes, with a walking foot it had likely belonged to a quilter. But with no pics of stitch samples then who knew if the machine was running or not? Not that a pic of the stitches necessarily means that the machine is working, as I have seen Berninas for sale on ebay, and the seller, who had a few Berninas up for sale at the time, had used the same stitch sample for each machine. They had photo'd 5.5mm wide ornamental stitches with a machine that only went up to 4mm which was a bit of a giveaway.
There was a flurry of bidding towards the end of the auction, so I daresay the prospective purchaser had spotted the walking foot tucked away in the case. I couldn't see any green accessory drawers though. I hope it goes to a good home.