Question for ya all corporate fellows....( I'm ex-airline, now with a fractional)

I keep on hearing a corporate job last anywhere from 5-7 years, even the "great" corporate jobs. Is this thruth or myth?

Good equipment, diverse flying, good pay, I'd think people wanna stay there

Is it that corporations let people go whenever the stock price/market dips? Do pilots get tired of flying with the same dude day after day? Do the senior pilots grab all the good trips? Any of the above?

Had a conversation with a guy at London's Harrod's aviation FBO. He is typed-rated in the Global Express and Falcon 900/900EX and looking for a "permanent job"

Why would a guy that marketable be looking for a job?