I am making some assumptions here, but ...
If you are buying new items from a seller, and you have used them several times, and they still have multiples of the same item left, then they should properly be registered as a business seller.
If you buy from a properly registered business seller, then there is no buyer protection fee.
"There are two ways to be fooled. One is to believe what isn't true; the other is to refuse to believe what is true.”
Søren Kierkegaard, Danish philosopher (1813 - 1855)