Oh I'd agree with you. They're definitely out there, finding one is the tough bit.White tank treatment.
Ask the peddlers these days. They'll tell you that all this imported stuff must be kept in the same white tanks they come out of or the pattern goes to shiat.
Some call it "grooming" . Others call it lying.
I almost feel sorry for the people that are trying to aquire rays today. Very hard to place trust in anyone to get pure unmanipulated rays that are really what they are marketed as. Hell even most pics taken of rays these days look messed with......
That being said I DO think a white Pearl exists.
It's a bit of a shame though but I suppose it's also nature of the beast with animals whose coloration is so dependent on their environment. I feel that often times those selling the animal aren't even entirely sure of it's lineage.