I rip from vinyl if I am in the mood of actually buying the music, which I get from record sell/buy shops mostly. Not many around though in the Netherlands. Recently bought a couple LP's in London

But mostly I get my digital music from illegal sources on FLAC. The exact sources I won't discuss, as it's heavily frowned upon around these parts. If you want to know, I can do so in a PM.
Main reason for this is money; I love having a large collection of music, and I currently have a little under 100 discographies (used to have 450ish, but I cleaned up). Buying that would run you multiple thousand dollars.
And besides I only would buy something if I'm absolutely sure I like it, because I don't want to waste my money on a disappointment.
In order to remove misconceptions: I don't not buy music because I think only a fraction of the money actually goes to the artist; I do it because I just don't have the money.