I guess that perceived scarcity plays a huge role in this. I wish I knew how to manufacture such. (this is of course, in addition to competence, which I take as a given).
I read an article in the Economist years ago about this phenomenon. Why pay so much more, for example, for the "In a World..." guy to narrate your movie preview when there are dozens of voice actors available. They concluded that since the preview was a minor cost no one would take the chance to cheap out on the voiceover guy because if the movie bombed the guy who cheaped out on the coiceover guy might be blamed.
Compensation for executives IS crazy, but her taking the job in the first place was pretty crazy brave, too.
Another headline on Arstechnica: Marissa Mayer "couldn’t be more proud” of achievements at Yahoo"
Marissa seems to me, like one of those persons always living in a dream. Her ship has big holes and heading full speed straight to the cliff, but she still thinks she's a good captain.