- Risk mitigation. Even if you are 90% sure that things will go up and to the right, it still might make sense to cash out a bit as insurance. Especially if you aren't giving up any control
- Buying allies. If you make a lot of other people rich, they will probably become your biggest boosters. Might not be a bad idea to have some rich allies rooting for you. And you might need some political favors in the future.