Why do some people prefer white feet over black or people of colour feet? Serious question? Especially sole lovers?

As I try to understand foot fetish I understand the appeal of toes. I was once told it's just the feeling you get when looking at a pair of soles.

But I really want to understand what actually turns you on about feet and what's doesn't? Because a lot of the time only white girls or pale girls get feet attention which tells me there's someone different or unappealing about dark skin girls feet who in my opinion the soles look exactly the same

Please explain to me