When you selling older lots not all cards are the same grade cards.
Older lots no 2 two people would grade the lot same way.
If it's new lots of cards, then maybe.?
We are not professionals graders.
Ever PSA don't always grade the same cards way. How care we?
That's why we add photos showing avg.
When you buy older cards the seller over states the grades are. The cards are over graded on 95% are less their seller says they are.