"It's already gone down and the more he signs the less it is worth. As always, it all depends on the law of supply and demand and we can can only speculate about it. Odds are in favour of flippers/sellers, maybe not for as much as they were…"
"Metallica would be at the very top of my list and by far the most valuable on your list. Though I think it's unlikely they will sell signed albums online. They usually have a release event (usually in London) where they do a signing session for…"