Would you want to be able to change your brain so that you can productively work 70 hours per week? I wouldn't - it'd quickly become the standard against which you're measured, while the rewards for passing the test stay about the same.

There's a similar argument to be made for being able to share your life on facebook - it displaces alternative interpersonal interactions, so you have the same amount of human connection except with your social graph sold to marketers.