High percentages of rejected cards do not always indicate a submitter trying to get altered cards past graders. Depending on the service level, value of cards, grade of the card and who is submitting the cards, grading companies are known to reject 100% original cards.
Things to think about:
1) Graders can know whose cards they are grading.
2) Higher graded cards and more expensive cards are rejected more frequently than lower graded or less valuable cards.
3) Not all graders are competent and some lack sufficient experience/abilities to assess alterations or the lack thereof.
4) Most cards are not graded by more than 1 grader.
Of course grading companies will deny most of the above but anyone who submits frequently will tell you the same thing.
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