1. Forged signature: The signature sold by CSA may be forged. Because of the lack of official basis, they may imitate the signatures of celebrities through technical means, which is cheaper and therefore cheaper.

2. Non-star figures: If the signatures they sell are not from star figures, the price may be relatively low.

In a word, CSA sells cheap signatures, probably because they sell forged signatures or not famous signatures. I suggest that you carefully distinguish the authenticity when buying to prevent being deceived.