I look at my collection, and I see that I bought tons of the exact game, over and over again. If it was good on the Nes, I'd buy it for the Gameboy, then I'd buy it again for the GBA, Snes, VC, or what have you. In fact, I made a thread about it a while back. My most recent purchases were God of War Collection (with GoW3), and Super Mario All Stars limited edition. I'm sure I'm not the only one. But look at Nintendo's history!! They've been re-releasing games like you wouldn't believe, since day one!! I thought this was an interesting read. It doesn't even list all of the re-releases. Anyway, enjoy:
http://wii.ign.com/articles/114/1140388p1.html
They're the "Disney" of video games!