Dealers use major TPA's because it allows the items to be sold for money. For instance, a Mickey Mantle signed baseball with no TPA typically sells for the 350 dollar range. The same ball with a PSA letter will most likely sell for the 600 dollar range. That is a big difference. This happens because the buyer feels more comfortable buying it because it was authenticated by a nationally recognized TPA.
Yes its true there may be more knowledgeable smaller scale authenticators out there, but they are not major companies that are nationally recognized. If they decided to expand and become major companies like the other TPA's, maybe they can push them out and take over. But until that happens the larger ones are going to be the ones in demand. Not everybody can know about the smaller scale authenticators doing it out of their "basement", even if they are actually better at doing it.
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