I think it's odd that the standard Kem plastic cards talk about how their 100% cellulose acetate plastic is superior to vinyl (see example below)...and with that in mind, I wouldn't pay a premium for those cards unless I planned to never use them and hold them as a collectors item.
From kem-cards.com "Kem plastic cards are truly the highest-quality, longest-lasting playing cards in the world. Kem plastic cards offer a number of advantages over paper or vinyl playing cards..."
So I have to ask in case Jim sees this: if you have a few of these, do you want to sell some here on CT? Save the ebay fees, and make some of us (ok, ME) happy as well. I have a tiny KEM collection, and so I would love to have some really unique cards like this. (Yes, I'm watching it on ebay too!)