How do features like autographs, memorabilia pieces, or limited editions affect the desirability and market value of sports cards for sports other than the big leagues (e.g., soccer, MMA)?

How do features like autographs, memorabilia pieces, or limited editions affect the desirability and market value of sports cards for sports other than the big leagues (e.g., soccer, MMA)?
Admin 2 days, 19 hours ago in Sports Cards - Other
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