Frankly, I'm just a cheapass. There, I said it.
Plus, I see a certain level of piracy as the norm. There's been digital piracy as long as there's been digital media. Hell, there was *analog* piracy when there was only analog media (there's a famous episode where Charles Dickens visited New York in the late 1800s and was outraged to see counterfeit copies of his books being sold for 5 cents on the street corners).
I feel that it's just a natural marginal effect of marketing information. More people want the information than are willing to pay what the owner is charging. With material products, they have little recourse but to pay or do without (or purchase a cheap knock-off). With information, it's far easier for someone else to reproduce the product.
I think my perspective is permanently skewed towards sympathy towards pirates because I still fondly remember the demo and sneakernet scene from the 80's, when everyone had a Commodore, and the big thing was to trade around floppies with software that came from a friend who knew a guy, who got it from this other guy, who knew a guy who actually had a 300 baud modem and spent all night downloading this from a BBS....
My one hard and fast rule is that if you're going to pirate data, you don't try to make money off it. Here in the US, that's not much an issue. Overseas (especially Asia), there are street markets chock-full of pirated software for sale. Not so kosher with that, although I have to confess to buying some pirate compilations of Koei games in Shanghai just because they had a few games on there I'd never even heard of.
And I grabbed a movie, just for the mash-up cover art. The title was "Mary, Mother of Jesus" but the cover art was a mashup of stills from the movie (crucifixion scenes mostly) with stills from Lord of the Rings, Dungeons and Dragons, King Arthur and a few other fantasy movies. I figured either this was some serious false advertising, or TEH BEST MOVIE EVAR. Sadly, it was just some made-for-TV Bible story movie with a distinct lack of dragons, armored Messiahs and orc armies. But for 10¥, the cover art was worth it either way. In that case, I don't consider it rewarding piracy but rather rewarding the mashup artist.