Yeah, I toy with the idea of selling them sometimes, Queen are probably one of the top 3 collectable bands in the world. My boss in the rare records shop where I worked has an immense collection valued at about £20,000. He has a numbered copy of Bo Rhap (200 pressed) on blue vinyl that is conservatively valued at £5000 alone.
I'll never sell 'em though really, i'm too attached to them.
I'd never sell any of my records, either.