I have that on some of my toploaders, mostly on modern stuff that's seen light back when I did the occasional flea market. No damage to the cards.
The old pages made from pvc plastic do get sticky, and can damage the cards, but not always.
In a related note, I did an unintentional test of a few storage plastics. I was doing some work in the attic which has a sunny window, and forgot a few cards in a page and a few in penny sleeves. Then moved stuff in front of them. I was rearranging a couple months ago, and found the cards.
Both the ultra pro page and the pennt sleeves had turned brittle, like they crumbled when touched. The penny sleeves had shrunk a bit. But there was no fading at all, and no other damage. The proof of this was a 1991 topps that was halway into a penny sleeve. Severe fading outside the sleeve, no fading inside the sleeve.
So I can say the penny sleeves and ultra pro pages keep cards good despite about 5 years of exposure to sunlight.
Steve B
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