I suggest you read these two articles that gives you some of the reason behind the yearly release of franchises: <a href="http:&#x2F;&#x2F;www.gamasutra.com&#x2F;view&#x2F;news&#x2F;115152&#x2F;Analysis_Koticks_Raise_The_Price_Comment_And_AAA_Game_Value.php" rel="nofollow">http:&#x2F;&#x2F;www.gamasutra.com&#x2F;view&#x2F;news&#x2F;115152&#x2F;Analysis_Koticks_R...</a><p><a href="http:&#x2F;&#x2F;www.wired.com&#x2F;2007&#x2F;12&#x2F;call-of-duty-gu&#x2F;" rel="nofollow">http:&#x2F;&#x2F;www.wired.com&#x2F;2007&#x2F;12&#x2F;call-of-duty-gu&#x2F;</a>