He believed in the nutritional supplement and beauty company when others were convinced it was only a pyramid scheme. But now, Carl Icahn is off to find new projects. Icahn sold about $600 million of his 16% Herbalife stake back to the company in recent days, according to sources. The liquidation leaves him with just a 6% stake, worth $400 million. The move also puts his holdings below the level stipulated in an agreement Icahn has with the company, so he will give up the five board sea...