In the mid-90's, a real copy of The Black Album was selling for upwards of $10k.
When artist dies ones albums may become very hot. Whitney Houston first album was selling at high dollar for about a month or two than back to buck and a half.
"Very hot" is one thing, $20,000 is another. Even if it was on 200 gram, solid 24K gold, it wouldn't be worth $20,000. Who comes up with this stuff?