Nostalgia is a big factor for veteran gamers. As we long wistfully for the days of yore, full of Opera Houses and Triple Techs, companies scheme to use this wonderful emotion for profit. Square-Enix is a particularly egregious offender, but damned if we're not willing to buy that game we loved just one more time.
Final Fantasy III is a bit of an exception, since the title was never truly released in regions outside of Japan before last year. But how willing are you, as gamers, to buy rehashes of the very same game? We got the entire Final Fantasy Advance series (I, II, IV, V, and VI) and now Square-Enix wants to release a graphically overhauled version of FFIV ... again? With the inclusion of Final Fantasy Chronicles on the Playstation, this will be the fourth release of the same freaking game.
Do you need extra features or updated graphics to re-buy a game, or do you refuse on principal? As we know is that as long as we keep buying them, Square-Enix will keep remaking them. Pah.