Spotify isn't a radio service, it does have a (fairly iffy) recommendation service, but it's a fundamentally a "I want to hear this track or album by this artist, there it is, click play" service.
Think about it as the equivalent of buying a measly 3 or 4 CDs a month back in pre-internet days. I don't think that's an excessive amount of music if you're a music-lover.
I would easily download much more than that each month, and would be happy to pay for an omnivore plan to match.
If you're happy buying 3 or 4 CDs a month for £30, well nothing stops you now does it? Emusic even offer that kind of subscription package, or at least they used to.
Do you not see a risk to the company offering an unlimited download package that some (many?) would subscribe, download everything they've ever heard of, and can think of, then cancel? Or after 2 years of subscribing if they announced they were changing their model that people would do the same?
When I was paying for CDs, I was paying for something tangible and worth money: the concrete delivery of a piece of plastic from the other side of the world into my hand.
Now that this is not the distribution model anymore, I am certainly not happy to pay £30 a month to get the equivalent of 3-4 CDs. Times have moved on. £30 a months should buy access to everything, not just to 3-4 CDs' worth of music.
90% of the price of CDs is distribution and packaging. Those costs are nil on the internet, and therefore the price should be adjusted accordingly (and the record labels go bankrupt). If they can evolve and start providing a better value-add service (like, maybe, a very good interface for finding and downloading music) then they might be worth something. Atm the labels are just a leech on the back of artists and the public.
Anyway, if you must sell music trac-by-track, I would consider a per-track model that costs 10% of the price currently being used - i.e. 10 cents per track. But I probably wouldn't spend as much as if I was offered an all-you-can-eat subscription.
90% of the price is a CD isn't distribution and packaging - an album CD in HMV at £8 costs the same to distribute and package as a CD single for sale at HMV for £2.
The vast majority of cost of producing and selling a hit album is marketing, and that cost hasn't changed significantly for the labels, at least not yet.
It's quite possible that the economics of 10 cents per track might work out, but it'll be without the major labels marketing teams.
Whether that should bother anyone, that's the real question.
Spotify isn't a radio service, it does have a (fairly iffy) recommendation service, but it's a fundamentally a "I want to hear this track or album by this artist, there it is, click play" service.