Well, i'm going to do a revelation here: My Xbox and my Wii (used to be) are pirate. But before explaining, here's some context.
In Colombia, due to exportation prices and the such, when everything more than 60 dollars is passed to pesos (our currency) it becomes expensive as hell, and every game suffers that. Almost every gamer in Colombia has their consoles pirated so they can play games they sell on stock discs or have ROMs, emulators or the pirated games on the PC. Despite that, I sort of see it justified, as not every one is a rich and not many people have advantages.
Now yeah, my Xbox was bought pirated and it even included emulators inside, but after some years, I sometimes asked my dad to bought me some "original" games (by Amazon), but even I still continued to buy pirated games. My Wii was also bought pirated, but I wanted that to be original, but I didn't complain much as I got to play many games, and I still bought from time to time "original" games. It was only till I updated my Wii to play Metroid Prime Trilogy that it made useless the method (I think it was a chip) that the Wii got pirated because it was probably very outdated. After that, I started to get my games from time to time using Amazon, which is still the method I use to this day.
Though I do want to support the companies, by buying the "original" copies and getting the official rereleased, I can see pirating as an option if you're short of money, and like some of the guys said here, to get games that are rare, haven't been rereleased and/or are exclusive to Japan or any other country. Besides, if it wasn't for emulation I wouldn't had discovered some awesome games. Just make sure you also get the official games and also learn how to pass pesos to dollars if you want cheaper games.