Why would Brin and Page sell enough shares to lose their majority vote? Google's IPO, and their insistence on keeping control of the company via two classes of shares seems contradictory to this move.

Obviously they don't need the money, and don't need to diversify their holdings to have a luxurious life. So why do it?

Also, a majority share held by Brin and Page was what was supposed to keep Google from doing evil.