Streaming 1500 songs of an album = 1 sale = 12-20 dollars in income to the owners of the music.
I don't know how much you get from selling a digital album for $5 on iTunes, but I believe they take like 30%, so say = 5 dollars in come to the owners of the music.
Selling a physical album for $5 = a loss until you sell over a certain amount and still then the profit will be small as there's logistics, pressing, materials, stores cut etc.
Just look at Universal Music Group's valuation and income statement since streaming blew up
Other than that, I have nothing more to say or read on this topic.