Because the people they want have options. If you want a hotshot CEO who could go and work for Google and make tens of millions per year, you have to sweeten t

Because the people they want have options. If you want a hotshot CEO who could go and work for Google and make tens of millions per year, you have to sweeten the pot to get them to accept. So they have golden parachutes which say "for any reason, except fraud or other criminal actions, we guarantee you'll get $X millions when you leave".