The Kellogg's phenomenon of curling and cracking has always puzzled me. Every kid absolutely loved digging through the boxes of cereal to find the treasured cards at the bottom, but I couldn't help but wonder why Kellogg's even bothered producing cards that broke down so easily. But now I think I have an answer. I'm not a scientist, but I believe the cause of all this destruction is the humidity. Every single 3-D card I had in New York eventually either cracked and/or curled. Every single one. The relative humidity there is quite formidable in summer and the winters are dry. Perhaps the damage is a result of these extreme changes in the amount of moisture in the air?
But now I find myself in California where (even before this ridiculous drought) it is bone dry throughout the year. The difference between the right coast and left coast in this regard is so freakin' drastic that it makes me laugh!! I've picked up a few 3-D cards since being here and every show I attend has people selling them. I have yet to see any of these cards show the telltale signs of curling and cracking out here.
So I imagine the viability of your Kellogg's cards all depends on what part of the country you live in. Again, I'm not a scientist, so the use of 'humidity' might not be the proper term, but you understand what I'm talking about.
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