Unlike undergraduate school, perceived prestige of a medical school has much less impact on your ability to match into specialty and thus your ultimate salary as a physician. With the vast majority of medical school graduates finding a residency slot via the standard NRMP, which the last holdout schools joined only a decade ago, removes much of the "old boys network" impact though connections still matter to extent. When you are in practice you will find that most colleagues care much less about where you went to school; where you did training (ie where you did residency) matters much more.