I think the simple answer was that pre-internet it was a tough card to find. Once the entire world went online, cards that were once deemed rare, were found to not be so rare, still tough, but obtainable. The E90-1 Mitchell being one of them. Obviously the E90-1 Speaker which was considered tough but no where near the Mitchell has proven to be much tougher to find, just as an example within the set.
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