So, if that's the case and we have them both in the same school, we might as well rent them an apartment / house or purchase a small property for them to stay in and safe a TON of $ we'd otherwise need for room & board x 2.
There is no evidence that the teaching at the most prestigious schools is better, so two remaining reasons to send one's children to them are to get a more valuable credential and to mingle with smart, well-connected students. I wonder to what extent living off-campus impedes this last goal. OTOH, dorm living could be distracting and a bad influence for some students at some schools.
