Basically no. If an artist is ugly but has great music, I can still listen to them and enjoy their music. But I probably wouldn't buy a dvd or something, haha
Of course the more attractive ones get more of my attention, because I watch their videos, concerts etc., and maybe even buy goods and such. I listen to many JE artists, but I don't like them just for their looks, of course not. I wouldn't listen to someone just because he or she is pretty, the music has to be good.