terp,
i guess you are somewhat right... it just boggles my mind that there would be a significant number of people willing to plunk $250 down on a test that can in some ways affect your life very drastically and not put in prep time. especially since the test, prima facie, seems very difficult and daunting.
i was always pretty adept at math. i thought i was hot **** just coming off an A in calculus when i started my gmat prep the end of this semester.. i popped open the OG and I knew right away that I was in for a long road over the next two months!
but anyway, if all of the sudden everyone preps their brains out and scores well on the gmat, the scale will just change. that's what standardized tests are about. you can't have more than 10% at the 90th percentile.