When I buy an album, I’ll make an effort to enjoy it for the sake of my investment, even if I don’t immediately like it. I spent money on it, it’s taking up space on my hard drive and/or shelf, and I want that to count for something. But subscribing to Rdio is a different kind of investment. Rather than investing in one album, I’ve invested in all the albums, which is the same as investing in none of them. If something doesn’t grab me right away, I don’t have an incentive to return to it, which limits my repeat exposure to only the music with the most superficial rewards. And even that stuff is quickly overcome by the newer and shinier stuff constantly spraying from Rdio’s fire hose.