How Much Does a Two-Point Coin Grade Really Change Your Return?

https://investorshangout.com/building-wealth-through-rare-coins-a-practical-guide-for-smart-investors-496296-/

Which questions will I answer, and why should you care as a new investor? If you're just getting into investing and someone told you that a coin graded 67 is "worth thousands more" than the same coin graded 65, you're right to pause