I'm not sure everyone would have the nerve to aggressively drop zero days, you don't know who you are going to cross, my paranoia would not let me.
I'm also not a security person, but I am sure there are people who have the necessary skills, but have the same nerves as I have.
Source: got sued by Sony for disclosing that they screwed up their ECDSA implementation so badly that you could compute their private keys (and then putting Linux back on the PS3 using that flaw).
Microsoft not doing that with Xbox (orig/360) hackers is why the Xbox One has really good security. They hired them instead.