If you say install base is the most important thing then you wont be developping games for any of the next gen consoles everyone would stay on the ps2 only, im not saying install base is not important, im just saying that theres more choosing what console to make games on then just the install base, and all the new consoles have a pretty small install base at the moment and even if the wii is selling great atm no one can be certain where it is in a year or 2 from now, the numbers arent everything, some psp titles sell better then ds titles and some ps3 titles do better then xbox360 titles, if ur game is good it will sell good.