WHO MAKES NGC's DECISIONS?

I BOUGHT A COIN A WHILE BACK OFF OF EBAY, A 1950 S/S(AS IT WAS STATED IN THE LISTING). I RECEIVED THE COIN AND RUSHED IT OFF TO NGC TO HAVE GRADED. I THINK IT LOOKS LIKE AN S/HORIZONTAL S, BUT I'M NO EXPERT. WHICH LEADS ME INTO MY PROBLEM, I GOT THE COIN BACK AS AN MS 65 WITH A LITTLE NOTE SAYING "NGC DOES NOT RECOGNIZE THIS VARIETY". WELL, I THOUGHT THEY WERE THE LEADERS IN THE GRADING AND CERTIFICATION FIELDS. I CALLED TO INQUIRE WHY IT WASN'T RECOGNIZED AND WAS TOLD THAT CONECA DIDN'T RECOGNIZE IT AS A VARIATION. WHY DOES NGC NEED TO HAVE ANOTHER COMPANY TELL THEM WHAT COINS TO GRADE? I MEAN JUST LOOK AT THE COIN AND MAKE A DECISION AS TO WHAT IT IS AND LABEL IT AS SUCH. IT IS OBVIOUSLY A REPUNCHED MINT MARK. WELL THAT WAS A BIG WASTE OF MONEY.