Oh I wasn't referring to just the GMAT. Someone who has an amazing background but a 650 gmat stands a better chance than someone who has a 750 and there is nothing special about them.
They may deny there is a method to how they choose their classes but I wouldnt be suprised if there was. There was an article on BW today about an admissions consultant for UG (charges up to 40K) and I guess a lot of schools dislike her because she gave up a lot of their secrets (she was assistant dean of admissions at Dartmouth). All these top schools had formulas they run people through. I wouldnt be suprised if they have something like that at certain business schools. You get point values for everything from GMAT, GPA (weighed by ug degree and school), your work experience, recs, extras, and of course essays. If you dont meet a certain number you are dinged. If you exceed a certain number you are accepted. In between those two values you get a more thorough review and are reevaluated for a ding/WL/accept.