Usually the big money goes for well trusted sellers, so for the Mobley you could pay 1,7 K for a 'ear', DG, mint cover, labels, inner sleeve and record, and you know what you'll get or risk 400 $ with a less trusted seller. My suggestion is to put records on ebay when that particular title is lacking for a while. I mean that when a Rollins' Colossus fetched for over 1,5 K, a lot of sellers rushed to put the same record on ebay. You actually don't know if the 1,5 K buyer is a lone madman or at least a couple of madmen fighting each others over any reasonable price. You should check the bid's history to have a view about how many people are really interested in that record and how much they are ready to pay for it. You can't do it on Popsike. So kh1958's suggestion is not so bizarre.