Actually, if I was buying those tools, I'd have no problem paying $1,200 to $1,300. At that price they could be sold on eBay for a pretty nice profit. That's not counting the box they were in. But assuming the box was included, I would certainly pay more, (but I always prefer to buy tool collections without the box if I can).
Even if the guy's asking price is nuts, there's no harm in making a proper offer...assuming you actually want some of the stuff. I guess that's the difference in buying to resell, and buying to keep and use. Personally, I don't want mismatched wrench sets and the dirty, beat up tools. But anything Snap-on will sell on eBay. Believe me, there is someone out there just waiting for you to list one of those older wrenches...to match the one they lost from their older set. Every one of those 40+ S-o wrenches would sell for about 35-50% of list on average. Problem is, each one would need a seperate auction, as they are all mismatched.
All you need is an internet savy teen to list them all!