Sharing and copying is usually a good thing anyway, Its just building off of eachothers good ideas. can you imagine if the game industry was like the technology industry and every major game mechanic was patented. There would be like ten AAA games.
I don't know why we're even talking about money....valve makes so much money through steam and they're competitive titles. They could probably just give half-life 3 away. That's extremely unique in the game industry where so often publishers make the decisions. They also have some of the most...
If its all just about tf2 then why did half-life 2 have the Korean thing? Also, a quick google search will tell you the "Saturn coming closer" bit is not true.