Media heads, and for the purposes of this thread, Game Developers and Publishers have realized that people will buy the same thing multiple times. Re-releases and ports are an effective means to safely test the waters of interest in a brand or franchise. After all, development time is minimal, distribution is as simple as making it available to any of the online channels, be it XBLA, PSN, Steam, WiiShop, what have you, and, if successful, may invite a relaunch of the property with a new AAA sized title.
On the...well, it's kind of the same hand. I guess on a different finger of the hand? The thumb? Whatever. Is the Enhanced remake. You know, those old titles that now have HD on the tail end, if not outright then heavily implied. These tend to mix the nostalgia of these old games with newer features like online multiplayer, redone graphics, new modes or levels, and the occasional control and balance tweak. They are a mid-step between the dated of the original game and the expense of a new, massive title.
And then there's the consumer. We gain the ease of having many of our favorite titles being easily accessible on one device. While I personally still have every system I own ready to go at any point, I completely understand how that is unreasonable or impossible for most. Getting those classic games is difficult to find, prohibitively expensive when you do find it, or, while good, not quite worth the hassle. Oh, sure, I very much enjoy Radiant Silvergun, but I'm not shelling out the cash for a Japanese Sega Saturn, plus the $100+ for the incredibly rare game when I can just wait and get it for $10 in a little while. $10 that, to some extent, will go to the developer, not some dude in California. (And Yes, I know a Japanese Sega Saturn is not necessary and modding a US model is incredibly easy, but it's the only example I could come up with)
What are your thoughts on rereleases and remakes? Awesome? Not necessary? Evil money grab? Bitter that you have neither the original nor the means to get the remakes?
And also, what have you bought on more than one console/form?
I have multiple copies of Super Mario Bros. 1 (x3), 2US (x2), 3 (x2), Legend of Zelda (x2), Metroid (x3), Super Mario World (x2), Final Fantasy IV (x3), Gunstar Heroes (x3), Sonic the Hedgehog 2 (x2), 3 (x2), 'And Knuckles (x2), Perfect Dark (x2), I sort of count the Street FIghter II games, but that's a weird case, Chu Chu Rocket (x2), Metroid Prime (x2), and more, I'm sure I'm forgetting.