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A) The down and dirty reason is efficiency. They need a quick and easy way of winnowing the field.

Of course, that's not the only reason. There are two more legitimate ones. First, the LSAT is the one universal comparator that they've got. How else can they compare a 3.8 in Basket-Weaving at Wombat State with a 3.8 in Particle Physics at Awesome Ivy U.?

Second, the LSAT, for whatever reason, really is a SOMEWHAT reliable predictor of first-year grades while in law school. In tandem with the GPA, which is also individually a good predictor, they get a combined VERY good predictor.

Of course, that doesn't explain why even two more points - which LSAC themselves will tell the schools is statistically insignificant -- can double your chances of admission. Them's just the breaks.

But -- you've got LSAT 180 to help you get those two more points -- and then some! So what are you griping about?