As Spotify did not long ago, Grooveshark has already announced its new cost for users who choose to pay for the service, which, in my opinion, are a bit exaggerated.
Suffice to say that a common payment account (the old ones) cost $ 3 per month, whereas now up to 6. But besides that, you lose functionality, so if you want to have an account as above $ 3 per month must be paid 4 times. Thus, 12 per month.
The basic difference between the account $ 6 and the 12Is that at first the user does not have mobile applications, so if you want to use them, will have to double the quota.
If we compare some prices offered by Grooveshark and handling SpotifyYou'll notice that just as the first service is cheaper, since its interim account is $ 6, while the Spotify is 5 Euros per month, money that today far more trades.
But, I think, the success prices does not come, Because people who are willing to pay $ 6 per month, no problems in putting one or two more, if the service is better, of course. So the competition is not reflected in costs, or at least not in most cases.