Video Games, movies, books...we live in a world where no matter the medium, if there's a chance to make extra cash off of the success of an original piece of work, chances are, it's going to happen. Sometimes it's for the better, more often it's not (we really needed a Speed 2? Really??). But the bottom line is, almost everything gets a chance.
And then when they made Speed 3 even Keanu was sad.
When it comes to games, just about