I think it's really more just a way to give a bit of incentive to sticking aroun...

loceng on Aug 9, 2013 | parent | context | favorite | on: Tumblr founder to get $81 million to remain at Yah...

I think it's really more just a way to give a bit of incentive to sticking around longer. With the money he now has personally he could do anything he wants - so we can assume that he at least in part wants to keep seeing Tumblr move forward.