>>5778412sure, that makes your statement partly correct, but is missing the point, in that it's unavoidable to catch everything through normal use of the product.
You want to blame a shitty environment, but the fact is that just leaving things out in the open can and will cause them to decompose faster just from being out there.
We're a board that looks down on people who keeps things stored away and fiercely prideful of their displays, and just doing this can cause problems with the unknown qualities of the toys, whose negative properties will not be known more than 5 years (or longer) from now.
BTW, that cheapo paperback can stay gray (not white) for years and years and years. Even then, only the outside will turn yellow. The pages inside stay fresh for decades, which shows how much air plays a role in degradation issues.
pic of a 40+ year old comic book that still has "white" pages, not because it's made of acid free paper, but because it was kept somewhere unread and lonely for a long time in a limited oxygen environment (a box).