There are a select few people who have proven to me time and again that they produce high-quality music worthy of my money (and, in my opinion, worth far more than I pay). Notably, I will buy anything done by the likes of Steven Wilson, Trent Reznor, Jenny Lewis, and MJK. It doesn't matter if it's a new group or a solo album. It doesn't matter if I haven't heard a single song. Some bands like Dredg are guaranteed buys -- again, even if I haven't heard a single song.
I know the artist doesn't get very much of album sales, especially digital ones, so I will buy directly from them (FLAC helps, too) where possible. Music -- popular music, anyway -- has been commoditized and watered down to the point that it really isn't worth buying. I "pirated" the latest Pearl Jam album because I was reasonably sure it was going to be a disaster (apart from the one catchy single) and I was vindicated in that notion. If I had bought it, where would I return my MP3s to?
I have never believed music isn't worth paying for. I don't even know how I would live without the ability to listen to music nearly constantly. I am very cognizant when I'm without it for even a day. This viewpoint wasn't cultivated by manufactured, commodity sound. It was born from the work of amazingly talented individuals who have the ability to take words and sound and shape them into something that has more meaning than either could achieve alone. How isn't that worth paying for... when it transcends?