For a company like Yahoo top talent is a seller's market. They have to vest the compensation if they want to have a chance at getting the talent in the first place.
Note that for example there's serious danger of reputational damage; someone who joins such a company at such a high level is in danger of getting their career derailed or worse.
As for the CEO, we can stick to straight observables: a number of people joined the company under the condition they'd work off-site, often in roles where that's just fine like customer support (easy metrics), and plenty of them were nowhere near a Yahoo office.
One day she declares that if you don't start working in a Yahoo office, you'll lose your job. As e.g. Maggie Lange at Gawker puts it:
"Mayer famously took her position at Yahoo while six months pregnant and had her baby last fall. However, unlike other Yahoo employees, she is able to bring her child to work to the nursery she paid to have built in her office."
Note that for example there's serious danger of reputational damage; someone who joins such a company at such a high level is in danger of getting their career derailed or worse.
As for the CEO, we can stick to straight observables: a number of people joined the company under the condition they'd work off-site, often in roles where that's just fine like customer support (easy metrics), and plenty of them were nowhere near a Yahoo office.
One day she declares that if you don't start working in a Yahoo office, you'll lose your job. As e.g. Maggie Lange at Gawker puts it:
"Mayer famously took her position at Yahoo while six months pregnant and had her baby last fall. However, unlike other Yahoo employees, she is able to bring her child to work to the nursery she paid to have built in her office."
(http://gawker.com/5987043/yahoo-ceo-marissa-mayer-installed-...)
That's just the most notorious I can remember, there are as I recall a number of others.