Some of the best high school students don't attend for college. More don't even take the SAT, and a greater number don't take necessary steps like touring campuses. Why is that? Inside Higher Ed points to what seems like an obvious solution: it's too expensive (about 80 percent cited cost as a major factor in deciding not to attend post-secondary school). This is especially a problem because it's a disproportionate amount of minorities -- about 48 percent -- many of whom came from low-income families. In other words, part of the problems universities are having with increasing their racial diversity may have to do with college cost.