Does PSA ever update their Price Guide?
I understand prices on low pop commons are hard to gauge the market on but for 1975 Topps for example they show a common PSA 10 as being worth $70. Looking at recent eBay completed auctions the cheapest completed auctions start at $87 and quickly goes up from there. Looking at current listings it is also apparent that there are no $70 commons to be had nor have their been for anytime in the near past yet the guide shows $70. How often, if ever, do they visit the values or is this sort of like Beckett values where you simply have to laugh and then go to completed auctions to figure out what something is really worth?