Yeah i too guess people don't bother listing their favourites. At least, i don't bother doing such things, because fb is nothing new or interesting anymore and it bores me most of the time. If i coincidentally see "pj harvey page" on the main page i simply add it, then i see "honeyhoney page" and add it, etc. That's why Dresden Dolls or AFP doesn't seem at the top of the list.
Dude it would probably take 3-4 hours for me to make a list of my favourite bands, books, movies. And i always have something better to do.