I will stream. The problem I have with listening to my own collection is twofold:
1. I'm limited to the music I have. While this currently is 20,000 songs, most of them suck. Why not stream the entire library of music ever made?
2. I have to decide what song I want to hear next. Yes, I've heard of the "random" button, but point #1 precludes this as a viable option.