Does MCAT even matter above 513?

a 513-517 gives a 75% chance at admission. A 518+ gives a 85% chance. But I bet the 518+ people have much better ECs. I think holding ECs constant, any score above a 513 will not yield a higher chance at admission. Yes a higher MCAT score increases your chances at t50s but it does so at the cost of lowering your chances at bottom 50s. So if you're like most people who and you dgaf about where you go for med school as long as you get in somewhere, scoring higher than a 513 does nothing for you