Well I think the AFA 85 one that Jeff bought was probably the most expensive one out there, although I have no idea how much he bought it for but I bet it wasn't cheap at all.
There are several people on RS that I know for sure would happily offer a $7k bounty on one in as good condition if not more. The unfortunate thing is that these things rarely pop up on ebay any more, it's all behind closed door deals. I would love to see one on ebay with no reserve but it just won't happen as people want the highest price possible and reserve auctions blow..
FWIW- there are four graded ones floating about and that's according to the outdated AFA pop report, so probably a couple more perhaps since that was last updated.