I'm the one who should
But since Paul Pope's career started in 1995, a cover from 1997 could accurately be called a...vintage Paul Pope cover. Sorry, Jimmy.
What's funny, too, about that Batman cover is that the seller never thought he'd get $5K for it. That's a record for a Paul Pope cover. I know the seller and he was asking for offers before putting it on eBay. He would have sold it for a lot less, but no one stepped up.
$10K for a Paul Pope cover is not supported by market facts, nor is $10K for anything SAGA. So I don't think anyone can so readily proclaim the Ghost variant cover is an "easy" $10K. But, again, all it takes is one.
I think that it's the absence of data that makes this whole argument fun. I don't think that it's beyond the realm of possibility that this is the only saga OA that will ever be released/exist. As such, there are no real comps. This also makes the exercise entirely unsatisfying because no one can be wrong or right. For fun though (and because you're local and generally awesome), Felix- I'll bet you dinner at Chez Pannisse or Gary Danko that the ghost variant sells for over 7.5k if it goes in sale in the next 9 months.