Well one expense you missed was the bandwidth pipe to allow all those people to actually access your servers simultaneously. Not to mention business insurance to cover your exposure from the half bajillion frivolous lawsuits a year. Oh then there's marketing, that runs up in the millions, MR T and The Shatt don't come cheap! Then there's the cost of the buildings that house your servers, taxes on everything in and out of your doors, other buildings and servers in other countries....ya you missed allot, hell I am probably missing a bunch myself! It is a great business model in the end, your going to make FAR more than you spend if you have a fun game that keeps people coming back and fanbois flaming (your free marketing, how ya like that?).