Because he want to wake up some day as America's First Dictator.
or
Bozo The Clown has real hair on his head.
or
Because an undocumented worker has been living on his head for the past 2 decades!
or
None. Bill Gates will just redefine Darkness® as the industry standard.
or
Finding a cabinet position for the thing on his head!
or
Seven. One to change it and the other six to sing about how good the old one was.
or