They do 20% over the first 2 years then 80% over the last 2. Turns into a pretty big win for them. They get to keep a lot of stock from people who quit after a

They do 20% over the first 2 years then 80% over the last 2. Turns into a pretty big win for them. They get to keep a lot of stock from people who quit after a couple years, plus they can justify not giving you raises after year 2 because hey you are making enough already (with stock they already allocated to give you).