"I believe in sports cards PSA guarantees to buy back the card if it is not graded properly, thus the buyer DOES have protection buying without seeing the card in person."

Casino chips are made in much smaller quantities than sports cards or coins. You can't grade a known quantity of 5 with a 70 grade scale. You can't grade a quantity of 200 made with a 70 grade scale. ...and the final reason that you can't compare casino chips to sports cards is, SPORTS CARDS WERE MADE TO BE COLLECTED PERIOD. Casino chips, as a whole, WERE NOT.

....a 5 known chip example, I sold it two months ago........held it in my hands, kissed it goodbye before putting it into a flip and sent it to its new owner.