I've heard this same thing many times over the years. There are instances where a larger number of used pins hit the market around the same time and that causes a temporary dip in prices. You know, its that thing called supply and demand. Right now its because there are a number of interesting new games coming out and people are dumping games to free up space/funds. Once that supply is soaked back up, prices correct, it always does. The only exception it seems to this is when a remake comes out. Prices typically correct to remake price point, unless that remake is higher than the original used selling price (BDK).