Same here, rdio is a giant preview platform for me, and it's a surprisingly great experience when you follow a bunch of people with good taste (heavy rotation section, collaborative playlists, etc.) - however everything I like gets bought since I want to own my music and prefer to keep it even if the licensing deals or the service itself changes. However, that means that there's actually a lot of overlap between my own personal (digital, lossless) collection and the one I have on rdio.