I agree. Amazon could also ban third-party for certain classes of items or make it harder to be a seller of those items. Camera equipment is notoriously fraud prone, and was before Amazon was even a thing.
I only buy used camera equipment from B&H or Adorama, and even with new equipment I am very cautious on Amazon. I tried getting used lenses a few times on Amazon and every single time the first order was the wrong, cheaper version of the lens I paid for. Amazon always quickly sent the right one, but I'd rather not deal with hassle. Particularly, since at that price point B&H or Adorama both have free shipping.
I only buy used camera equipment from B&H or Adorama, and even with new equipment I am very cautious on Amazon. I tried getting used lenses a few times on Amazon and every single time the first order was the wrong, cheaper version of the lens I paid for. Amazon always quickly sent the right one, but I'd rather not deal with hassle. Particularly, since at that price point B&H or Adorama both have free shipping.