Like I said, I see it similar to using an adblocker, and I could say the same for advertisers since they invest millions into advertising and people who make ad-funded content on the Internet get money this way, but most just block ads anyway. It's not a completely apple to apple comparison since most people hate ads and people who make ad-funded content don't typically invest millions into what they're making, but there's still a comparison to be made.
I usually buy it if I like it (buy it physically, that is - I don't see a point in paying for files, unless it's a game or something), although it's not a strict personal policy of mine.
Another thing I would like to add - which specifically pertains to music - is that if you're streaming music on, say, YouTube, and are using an adblocker, why not just download the album? The artist isn't getting money from your listen, and most artists/labels put their entire discography up for free. Usually if I'm talking about piracy with people I bring this up, because I don't really see a reason why you shouldn't be allowed to just download music seeing as free streaming is so widespread nowadays, and most people just use adblockers. If it's OK to listen to it online, why does downloading it make it illegal?