Of course you invest in the game, but it's two different game, and like it or not these characters usually copies of some common models with some tweaks. Or do you only play games with totally new models?That's a weird way to see things.
Well, of course some people play those game to jerk off, they probably won't get upset, that's fine.
But at the same time - immersive people will get emotionally invested in a game.
Good games usually make people feel emotions, if the game doesn't make you feel any, it's either just a bad game or a shitty fuck fest without any plot/char development.
Some investment ok, but the current EDS in this thread is ridiculous.