It doesn't matter, performance is not the only concern. Connections and domain knowledge are even more valuable. Let's say you're Amazon and you pay your CTO a respectable $250k/year. Along comes Microsoft or Google and offers him ten times as much. He's rational so he accepts and take with him all of Amazon's technical secrets to success. Even if there were national regulation capping executive pay in the US, other countries would hire away all of the top players with all their knowledge and connections. It would be a disaster. Is executive pay crazy? Yes, often. But the market supposedly is efficient and the pay is that high for rational reasons in many cases (not all!)
