The way I see it, the only way I can get legit NES games nowadays is pretty much eBay. And when I buy from eBay, Nintendo doesn't get my money, some idiot who sells bootleg Star Wars DVDs that already bought the game gets it. So to me, there really isn't any point. I can understand getting angry over the legal aspects of emulating PS2 or Xbox games, but Atari 2600? Commodore 64? Sinclaire Spectrum!? Sega 32X?!?! What are the odds of me being able to find a Sinclaire Spectrum, not to mention games, even from eBay?
I have my standards for emulation: only download games that are out of print. How is this any different from downloading someone's .ISO of a Star Wars OOT laserdisc?