Their business model
![](http://lolbot.net/pix/17266.jpg)
http://gamasutra.com/view/news/16492...freetoplay.php
![](http://lolbot.net/pix/17266.jpg)
Once the item store was introduced, revenues from item sales alone were four times larger than revenues from sales of TF2 itself, and after the free-to-play transition was finished, overall revenue was up 12 times higher than monthly TF2 sales were.
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