Everyone downloads movies/roms/music for the same reason, the rediculously high price we are forced to pay for entertainment.
Everything but am/fm radio has seen stupidly high price increases in the last 10-15 years.
20 bucks for a movie? Which is just a half ass rip off off countless movies before it. If its original, or something I have been waiting years for (transformers for example) I am always willing to purchase it, but 90 percent of what comes out on DVD these days is utter crap.`In theatres its even worse 13 bucks a ticket to take my 3 year old to see a kids movie? 23 dollars to see it once! Plus a kids snacky deal. Small drink, small popcorn and a tiny bag of nibs SIX Dollars! 30 bucks to see a movie, we don't see alot of them, in part because of the price, and because we both prefer the park, but when I do wanna take my little guy to the movies, I have to fork over the equivalent of a weeks worth of groceries for the 2 of us.
Music? Man 20 bucks for a cd, maybe what 1 or 2 decent songs? Screw that. These aren't they days where you could buy a record and the whole thing was quality(Vinyl is still the greatest), now its make a catchy tune, just one is needed and fill the rest of the album with junk.
Video games...hah possibly the worst offender. Hundreds upon hundreds of mediocre games get the stupid high price tag. I am in Canada so its even worse. DS game 50 bones. PC game 60 bucks. 360 games 75 and up after taxes. Orange box was a really good deal, stil 75 after taxes but you get what 5 games? thats 20 bucks a game, a solid deal. I buy a handful of games, and it costs me more than the console.
I have owned every EA NHL game ever made, I think its like 15 years now. 15 years at 50-75 dollars a piece, that is close to a grand. I have probably spent in the last 15 years, close to 1700 in games. (Football, and Hockey mostly). That is outrageous.
I can't say piracy is right, but niether is the price people are forced to pay for entertainment.