Every single one of my childhood heroes has committed suicide before my eyes by doing stuff like this. I always considered them having some solid morals and being wealthy enough would make this improbable but boy I was wrong. Oh well, they can't kill the old memories, yet.
To be honest Carmack have a good reasons to work on it even if it means work for TheEvilCorp: first of all if you listen to him he is truly interested in advancing VR tech. So he doesn't do it just for the money.
Also I guess he run out of money when Armadillo Aerospace has failed and at least before he talked like he want to make second attempt in space industry and this will require a lot of money.
Good for him then, but AFAIK he is still very much into space and I hope he'll have another chance even if it's gonna be funded by money Facebook gave him.
PS: Might be something changed by now, but I hope not. I really need to check latest podcasts / interviews with him.
