1956 Roberto Clemente Gray vs White Backs

Hi Guys, I could be off base, but why does white backs go for more money then gray backs? When gray backs are more scarce in the low numbers. The Roberto Clemente POP report is very low for Grays to Whites. The White POP is 2407 to 61 Grays. I would think there would be a higher premium for the Clemente Grays then Whites. Any help would be nice. I'm very new to the vintage card sceen. Thanks again Bobby.
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Jeff