A fan recently asked Weird Al if co should buy Al's CD or the entirety of his last album on iTunes. Al did the math, and mentioned that he makes more money from a CD sale than from an equivalent electronic sale.
Someone then went on posted the math.
http://digitalmusic.weblogsinc.com/2006/06/14/weird-al-yankovic-says-digital-is-a-raw-deal-for-some-artists/ "Surprise." 85% less income for Al if you buy on iTunes.