Meh, I think it's pretty clear that I have no morals, so for the most part I couldn't really give two shits about piracy. That being said, I try to buy my games when I can and when I feel that I will get my money's worth out of said game. Now make no mistake, I'll pirate games when I'm not sure if I want to buy them, let's see recently I've played Dragon Age: Origins and The Saboteur. After what I've played of them both, I am looking to buy DA:O when I have extra money, and I'm extremely glad I didn't waste money on The Saboteur.
I'm reminded of an interview, by John Riticiello (?) he's the head honcho at EA right now, and he stated that he sees piracy as an extended demo for a game. Basically he's saying that if someone is going to pirate the game in the first place, then no matter how inaccessible to pirate a game is made, you cannot force that person to buy the game. S/he'll either pirate it or ignore it. However, by the pirate playing the game for free, you at least have a chance to earn that person's money. I just think that is a very interesting perspective, personally there have been games I've pirated that have then convinced me to go out and buy the game and in the future, buy it's sequels.
On the topic of "I has cartridge/disc so therefore I has right to download ROM and warez!!11!!1". I'm pretty sure that legally it doesn't actually matter if you have the original cartridge, ROM's are still illegal. What I've been in the habit of doing lately though, at least for my PSP and DSLite is that I will download the .ISO or ROM of a game that I purchase, so that I can keep my games shrink wrapped "factory new". I was gonna type more but I forgot, so that's all.