I don't care for people emulating really old games, the alternative is to track down a retro console, buy an old tv that works with the components and hope to god that the console isn't dodgy, which in all is bs (as some of these games aren't available on PSN, XBLA and Wii) and only hardcore enthusiasts would go through all that trouble to play an old game as it will probably cost you a ridiculous fortune better spent on a newer game.
Besides, apart from really rare old games, are you really willing to spend any more then 50p / cents on an old game? Kind of defeats the purpose. To add to that, most of the old developers went out of business years ago or not too long ago, so its not as if you are paying anyone other then the console owner that the game was available on at the time, most notably, Nintendo.
I'm all for raising the profile of developers as the game industry is one of the few industries that actually gives a damn about its audience anymore and creates work of art, so I have a profound hatred of pirates. But if it is as old as gameboy and nes etc, emulate away, I don't care
