I love having the physical cartridges, but on an emulator, I can play on a better-looking screen even than any of my TVs (or, if I ever get a good TV, I can play it on there through the Homebrew Channel) and I don't have to worry about the cartridge battery dying (I was really torn up when my G&WG1 save started crapping out; I spent the better part of my childhood getting that 1100+ score on Modern Manhole.). Plus it opens it up to romhacks, of which there actually are a fair number of good ones. Also, as mentioned previously, I have no money. I do have standards, though; I won't download a rom unless it hasn't been rereleased recently and can't be bought new (if it's only available used, then I'm not really taking any money away from the guys that made the game), or if I've bought at least one rerelease (and if a game is rereleased after I've downloaded it, I delete my rom, or at least hide it somewhere and don't play it, and try to buy it as soon as I have money). I also try not to get them through BitTorrent, because distributing is definitely illegal, and I have a feeling most of the people I'm seeding to don't have as many scruples as me.