Why are the 2004 "peace medal" nickels....?

I bought a few rolls of these in 2004 and see ads in Coin World that ask over $20 and $10 for the P and D rolls, if I remember correctly. Why so much?
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TD
here's a set I sold for $70.
The P's were struck under greater pressure, thus they are slighty thinner, hence the short P roll.
Jim
Box of 20
<< <i>another thing about them is one roll is shorter than the other. Not sure what that's about though.
The P's were struck under greater pressure, thus they are slighty thinner, hence the short P roll. >>
Actually the D's were struck under HIGHER pressure which is why they are THICKER, hence the longer D roll.
It's a little counterintuitive but the higher pressure used on the D coins caused the rims to strike up more fully making the edges of the coins slightly thicker rim to rim. And since the coins are stacked on these thicker edges the height of the stack is greater and the roll is longer.