Study Prof

According to this article at BlackEnterprise.com more business schools are accepting GRE scores in addition to or in place of GMAT scores because it "boosts diversity."  Never mind that studies show the GRE is not predictive of graduate school performance, especially for minorities.  In fact, the study just reference noted, "When test scores play a major role in admissions decisions such gaps create graduate student bodies that are disproportionately White and male."  I'm a white male whose GRE and SAT scores really helped pay for my higher education, but when someone(?) is able to sell BlackEnterprise.com on the diversity boosting characteristics of the GRE in direct opposition to the research … well … it makes me shake my head in amazement.  Can anyone tell me why grad schools base their admissions criteria, even slightly, on the GRE?