Video review from Coinweek: The PCGS Grading Challenge - educational purposes

Most people miss the premise of this video is flawed. The PCGS challenge as presented is mainly useful for marketing. The test taker, Mr. Morgan gets a final "Score" of 5 out of 20 right guesses and 7 close. Yet since any PCGS coin cracked out and resubmitted is never guaranteed the same grade again since NO LEGITIMATE & VERIFIABLE standards are used to grade coins. PCGS says it is an art and not a science. Re-lsabbing and different grades occur all the time. So how can someone get an answer "right" or "wrong" when the correct answer is always an unknown? Don't fall for marketing b/c it can be very costly!