i treat rdio like a collection of full length previews that allow me to discover a lot of new music. stuff i like gets my money for tickets, merch and vinyl. i do not understand why anyone would pay $10 a month to listen to the same shit they have on their ipod.
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.
Simple, artists who are paid penauts would prefer getting paid more. We just released an album but we are not putting it on Spotify. Why bother.