I've just looked at my Spotify account: $56.51. That's not much for 3 albums over 9 years, but it's better than nothing. Better-known artists will probably do considerably better than this, although you probably have to be a global megastar to see serious money.

Total from all digital sales from all partners is a more respectable $657 and counting, although this includes purchased downloads as well as streaming. Importantly, these come from all over the world, from people who will never see us live and would never get to hear or buy our music. It's worth being online, but it's no way to make a living (fortunately I don't have to)