You get >50% of the value of the school (proxy for an IQ test, basically, although with the decline of testing this is less obvious -- still, even without rigorous testing, many people, especially those far from academia, consider "accepted to top school" to be valuable.)
I basically did this (out of necessity; I couldn't afford to pay for MIT), but it's worked out well, and it's worked out pretty well for other people I know. With dropout you need to distinguish between "dropped out to do X, or for decent extenuating circumstance" vs "too much drugs", though, when looking at stats.