If you diversify in several key top-line players instead of just getting the one Mantle, you can, when/if needed, sell off one or two to raise $10k or $20k, while keeping the rest. If you tie it all up in just one card, you have just 2 choices going forward: hold or sell.
So, for financial flexibility, and possibly tax ramifications (spreading out a realized gain over more than one year to stay under certain thresholds,) holding several quality cards provides more options.
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