Remasters also may ruin the nostalgia factor of the games, which would lead to your own fanbase turning against you if you mess it up. Better graphics, better gameplay, and other tweaks to the old game is fine if it fits the bill. If you are adding things in an old game just for the sake of trying to justify the price you are setting (and let's face it, remasters are expensive), you are just digging yourself into a hole. Age of Mythology remaster was a mess, and even the core fanbase hates it to the bone. I regret - fully regret - buying that piece of flaming guano full price when I saw it on Steam. And all that I did for nostalgia's sake. I still have the old discs of AoM from my childhood, and that's what I play instead.
