Do you worry about spam? e.g. people using your service to upload typo-squatted songs, or stolen music. It seems like it would be difficult to police 10 bad actors with the revenue from 5000.
It seems iTunes already has this problem. See "Time of your Life" by Greedy. LOL.
I am worried a little. Right now I keep an eye on the users who upload the most stuff daily. If I suddenly see one person upload 500 songs in a row (which I did once), I'll investigate.
As the service (hopefully) grows, I may need to come up with other ways to police it. Fortunately Apple and Spotify and Google and Amazon have systems to detect spam as well.
It seems iTunes already has this problem. See "Time of your Life" by Greedy. LOL.