It's always nice to be able to take something "off the table." If I had an investor that was willing to pay me, directly, for 10 - 20% of my shareholding in a

It's always nice to be able to take something "off the table." If I had an investor that was willing to pay me, directly, for 10 - 20% of my shareholding in a private company whilst additionally adding extra cash, I would take the offer too. It's not like Twitter decided to use half the $800m to buy-back shares instead of investing in the company, they just decided to get some cash out instead of just taking $400m.