No - I'm a subscriber to two streaming music services that usually have everything I'm looking for, and when they don't my next source is Youtube. If I find something I like and want to add to my collection, I buy it - usually after I've been listening to it for a while. I buy a lot of music, but it's after I've figured out that I like it and want to have it with me - the music is reward enough.

Do you use those services for music discovery or you stick to what you know already and only after you search for related artists?

I'm working on building a service for music discovery actually (http://beathound.com) - it's not a problem that's been solved yet. I use whatever I can get my hands on.