The first Killzone was a failure, didn't sell well at all. And a lot of people saw it as a failure, but now were on the third one. Bully was enough of a success to warrant a second one, Red Dead Revolver wasn't all the well. And Smuggler's Run had more than one game. That was also a Rockstar game if you didn't know, a lot of people don't know about that series. But the biggest thing is GTA the first and second one wasn't really that good, now look at the series.