He's not looking to keep the spoils from what it looks like. It doesn't even look like he was in it for a profit. It looks like he was in it to screw over the people that unjustly screwed him over. I'm not sure what exactly he did to get all the negative feedback in the first place, but it certainly seems like a very hivemind-ish thing to do.

I'd say this is the more concerning thing than his MITM attack, the hivemind nature of bitcoin users, especially in this forum.