If you think about it, a publicly traded company like PCGS is constantly expected to both grow and generate revenue. It's supposed to do this by grading RARE coins, there's your first clue. RARE coins are by defenition extremly limited in quantity. How then is a company expected to grow after grading nearly all rare coins? The answer is simple, get the customers to regrade. CAC is doing just that, by moving all the key members of not just PCGS but all the grading companies to CAC and now you have a new authority. If CAC is restricted to only grade the highest of the high grade coins, it too will not generate enough revenue to survive, so they will grade all the coins again to stay afloat and after that there will be another grading company that will supersede CAC to get people to regrade again. I wouldn't be surprised if they switch to a subscription based model service soon, if they can figure out a way to do that. CAC already kinda started that ball rolling with their Dealer Memberships.