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I will expand on Roy's answer a bit, it is not uncommon for prices in the Red Book or Krause to be off by as much 300% - 400% to the upside and 80% - 90% on the downside. For example, Krause may say a coin is worth $100 when it is actually worth $400. Or they may say it is worth $1000 when it is actually only worth $100. Now these numbers may seem extreme, but I have even seen worse.
So the simple answer as to why - the books are not accurate in regard to value.
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