What if the Zynga situation was reversed?
earbitscom.posterous.com
earbitscom.posterous.com
>one assumes risk immediately while the other does not.
That's not true. The company immediately assumes the risk that the stock will be worth way more than the normal compensation of that employee. Zynga took this risk for several years and the employees have made a ton of money - way more than they would have elsewhere. Why should Zynga keep assuming that risk when there is no reason to anymore?