In two charts.
I worked at Apple, so it’s not surprising to me that I sold more copies through iBooks than is generally true for other authors. What did surprise me was the relative number of Nook book sales.
Because this is a short story, here are the royalty percentages per sale: Amazon 35%, Nook 40%, and iBooks 70%.
As far as absolute amounts, let’s just say that it’s possible to carry the number of lattes I could order with the amount of money I’ve made, but it would be an awkward number to carry, even from expensive frou-frou coffee places like Blue Bottle and Chromatic.
I made, to the penny, identical amounts from Amazon and iBooks. Amazon includes foreign sales from Germany and UK; iBooks included Canadian, Australian, and UK sales. For Nook, I only have US sales, though I have enabled worldwide sales.