It seems to me that the more you include, the more groups will be involved, and the wider spread the intrest will be. The more the marier I say.
But you also have to be careful about who you attract. You don't want people bashing eachothers' interests. I think you could even include games like RidgeRacer, but maybe the offroad truck games would be too much. There is a common mind set to the race car games, and even if we don't play eachother's games, we can associate and talk about them in an informal fun manner.
~LoudMusic