These kinds of questions are usually answered with a single great card like a quality T206 Plank and a few spectacular HOF'ers. And maybe you buy a handful for the $200K and 10 years later they go up to $300K. But that doesn't mean the great cards are the best investments since you could purchase 1,000 good T206 commons for $20 each that may go up to $40 each in 10 years.
Yes, it takes more time to find and sell in quantity. But you may sell at a time when there are NOT 2 bidders who really want the quality cards and you take a loss. This doesn't usually happen with commons.
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