I don't ever buy CD's. A limited budget and an infant at home will do that. However, I will say that I enjoy their song "travelin soldier" and was considering buying the CD because my best friend is over in Iraq. But now, I just don't want to give them my money. As far as 90%, I will say that it may have started out that way, but I am betting that once word got around, more of "their fans" ceased being fans.
I was at a Festival in my (small) town where two little teenage girls were singing country songs in front of our church. They performed "travelin soldier", but even they felt obligated to let everyone know they weren't fans of the Chicks anymore, they just liked that song.