The other factor to consider, when comparing Spotify to iTunes, Spotify doesn't contribute to piracy. Files downloaded legally through iTunes are often shared illegally. So if a user legally buys an album for $4.99 from iTunes, offers it up via torrent, it’s downloaded by 100 people, then the sale of that album actually generated less than a nickel per listener. Conversely, a pure Spotify model has the potential to eliminate piracy. In addition, as bandwidth gets cheaper, technology evolves, and record labels disappear, there will be more money left for the artists. Granted, it's never going to be what it once was, but few things are. Technology, by its very nature, impacts the financials of everything it touches.
Of course, the flipside is, technology has also significantly lowered the cost of entry into the market. In this digital age, musicians have an unprecedented opportunity to create, release and distribute music, without the financial assistance of a 3rd party. And the truth is, music (as an art form) is better off for it. While I would wholeheartedly love to see the artists I listen to profit from their art, the harsh reality is great art is more often made by struggling musicians than rock stars. Granted, such a position is purely subjective. However, it’s not difficult to see that for most bands, their earlier work is their better work. And in a Spotify model, artists have the potential to be rewarded year after year for their earlier works.
Finally, is money really an incentive to create art? The last ten years has witnessed a complete financial meltdown within the music industry. However, it feels as if there’s more new music being released than ever, and no dearth in quality. If financial reward was a necessity, we would see established artists leaving the scene for financial reasons and fewer new bands entering it. However, neither is the case. Humans will always create music, and angry humans will always create Metal.