Well, risk taking is not the forte of the overachievers: at least not the typical overachiever. They're the ones (and I say this being a member of the group) who have learned how to avoid risks, rather than take them. Consider what the continuous inflated GPA system teaches a student: don't take courses that might drop your GPA and put you below the mysterious wall-street/google-cut (which is rumoured to be 3.7/3.8. It doesn't really matter if it exists - what matters is that there's a perception that it exists). Instead, take courses that "look hard". Stay in your major. Don't explore.

Risk avoidance, ironically, is a fantastic skill for risk takers to have --- as they end up minimizing risks skillfully.