Apple is going nuts in start-up acquisitions, but it is horrible to actually work for them. That's why they pay these 'aqui-hires' many times more to stay with the company. They can buy the company but nobody actually has to go work for them.
Naturally, this may cause friction with the regular employees who get all the 'company town' perks, because the cost of living is so tremendous that a new hire has to live in his truck. So the aqui-hires are not allowed to talk about their tremendous deal. You never hear about it.
Naturally, anybody with a clue is doing a start-up and hoping to get bought. :)