The '53 Mantle, '55 Koufax and '56 Mantle are highly collected and 'important' cards with continuously strong demand, so you should expect to get extremely nice pricing on them (assuming they have decent enough 'eye appeal'). I can't speak to the autographed Richardson rookie.
It boils down to how much you have into the cards (what you paid for them, especially if it was recently) and how you would sell them (accounting for fees, etc.), to determine if the additional $500+ cost becomes a burden.
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