This is always an issue with me because I'm of 2 minds about it. My initial and what I consider "correct" response is VULTURES!
The other half of me say "it's business", but come on, the guy just passed away, the supply was there, it's not like anything was super hard to find, so this is price gouging. A $10 bin album that can be found if you look doesn't turn into a $20 album just because. If your logic for raising the price is "Oh, he died, you know people are going to start looking for his stuff", I'm not a fan.
These are my opinions of course (Steps off soap box)