65,000 listeners a month – $800 in revenue. 1.23 cents per listener per month. That works out to 14.7 cents per year. To earn a modest $50,000, you would need ~360,000 monthly listeners. This doesn't seem sustainable without outside sources of revenue.
Spotify makes it easier than ever for an artist to get their work out there, which is great, but it’s similar to the publishing world, where most authors who self publish do so into the void.