It looks to me more like a 110KPSI (10/11) but I'm not sure of the measurements of a US Quarter.
Going by that it's almost certainly an Ardakan rather than a Kashan. I don't know if he's been unknowingly counting 2 ply wool as 2 knots vertically or if he's been counting the wefts as knots or intentionally mis-leading you.
Is there a reason you have specifically been looking for a Kashan? How does the rug look (since that is first and foremost the important thing)?
For a rug that size I would say it's a good price - you couldn't get anything Persian in good condition for even double that in the UK at retail. Obviously private buys and auctions are a totally different ballgame but even still it's a lot of rug for the money.