I think it's more of an advantage if you are URM, and lack of an advantage if you aren't. Which would translate to the same lack of advantage if you don't respond. But that's just my guess.
EDIT: By lack of advantage, it could still be perceived as a disadvantage, such as if it's between persons A and B, very similar applications, except one is URM, if they run out of spots. But it's basically more or les just lack of "preferential" treatment in that area in the admissions process, I think.
Last edited by Madshock; 10-19-2010 at 09:50 PM.