It would be, and it is. Which is why EA is doing it. >_>
http://news.cnet.com/8301-17938_105-57573434-1/after-launch-mess-ea-pledges-free-game-for-simcity-players/
Personally, I don't give two Bleeps, because I didn't rush out and buy SimCity, but now I kinda wish I did. Two for one...