I really think the people who actually BOUGHT the game should get something like 20$ in the mann co store or something, but I think this will make the game more popular.
I hate this because all newbs are gonna mess up the fun and the servers will be too populated.
I don't like this decision by Valve, I think the game should stay P2P.
If you've played it enough to get your money's worth why does it matter?
They've been making more from the in game store for a while anyway.
Also read this: http://www.teamfortress.com/freetoplay/faq.php