I love Spotify as a consumer. But frankly, I’d be willing to chip in a few more bucks.
Given the current system, I have to admire the creativity here:
They uploaded several tracks of silence and urged fans to listen on repeat while they slept.
Seems to me the simplest solution would be to start charging listeners the 10th time they play a particular song. That gives you all the serendipity and browsing you want, but it makes you pay to make a song a permanent part of your “record” collection. Still much cheaper than CDs.