Because they kicked him out? Because they won't get the tv exposure? Won't make it as far in the tourney?
The innocent players on the team lose the tournament exposure.
From a career point of view, if I'm a good player and I know what the school policy be if one of my teammates screw up, I'll avoid the risk.
It has nothing to do with anyone's ethical opinion.
The end result is innocent players have lost a chance for increased national exposure. You can blame the end result on the guilty player or you can blame the end result on the way the administration applied violation to it's policy. That's an ethical argument. Either way, the end result for an athlete whose goal is national exposure is not one they would be willing to risk, IMHO.
They can be models of propriety themselves, but it won't matter if their ladder to success is taken down by the stupid decision of a teammate.