Yah, i know they're just one game. :)
Never actually played all other Tales Of games, though... I only owned Tales of Destiny and that was it. After I finished the game(in 2P mode), I just wandered through the web, reading about the other games, their storyline, walkthrough, and even video playthroughs... :P
And yah, I know we can play 'em through emulators, but my comp's fre spaces are small now. Blame my brothers for downloading too much games... xD