There are so few references available to gauge price and rarity of AC chips. I usually use Archie's guide, Ricky's website, Ebay completed auctions, and this board's historical posts. Unlike coin collecting, it is much more difficult to discern chip values and trends since the sales volume is so low. Us "civilians" who are not dealers have to sort through lots of info, and try to get the best value for the dollar.
I guess I wasn't trying to single out this one seller or this chip , but get others opinions on where the higher end AC chip market is trending.