This impulse is all part of the plan, of course. Game makers want games on as many platforms as possible to maximize their potential audience, but they also know that their most devoted fans will repeatedly return to the well. Square-Enix happens to be notorious for re-releasing and remaking its games - Final Fantasy IV has been re-released nine times since first coming out not counting digital re-releases of that SNES original - but they're hardly alone in the practice.
The question is: Why do we do it? Sometimes a remaster or re-release represents a significant upgrade or a move to portability, a la The Legend of Zelda: Ocarina of Time 3D. Other times, though, it's just the same game on a different machine. Let's pick this one apart together. Take our poll and discuss in the comments.