@mpershan
The testing to qualify for extra time on SATs and all test require a very expensive edu testing report, sometime $2000 - $8000. Only the wealthy can afford this kind of testing and much of the testing is for ex time as the majority of educational testing happens in high school.
I'm not saying grades are perfect admissions criteria but the idea that these high-stakes tests are just wonderful levelers of opportunity is absolutely absurd.
@mpershan
I agree that's an interesting question, but some studies suggest extended time has minimal effect - particularly for students without SLDs. (Cawthon, et al. (2009). Multiple Constructs and the Effects of Accommodations...)