Below are quotes of what I've published in the ESTIMATED price guide section of my A.C. catalogs.

"For users of this value guide, it would be helpful to keep in mind that the following information has been compiled from various sources and represents what the author feels is a fair representation of estimated retail prices from established dealers for chips and tokens in excellent (near-mint) condition."

Estimated price guide values are not to be compared to "trade values" between collectors, or what chips are sold for on ebay or other online auctions. Collectors alegedly are not "in business" to make a profit. Retail chip dealers are.