I'm guessing it might be that 1/3 of those employees were upset that they found out about the initial policy change via a public facing blog post, possibly felt that the behavior of one of their main leaders was increasingly toxic and poisonous, didn't want to be associated with him and got a buyout. I mean, if I was working for a raging asshole who suddenly said "if you don't like me, here's 6 months salary" you bet your butt I'd take that. =)