"Buyer beware" is words to live by, and unfortunately the same shoppers who wouldn't bother to read an ingredient list (or look on the back of a World Championship) deck are going to see "Not Usable" on the front and assume that there is absolutely no use for the product. They won't realize that World Championship decks exist as a combination souvenir/demo/source of excellent proxies.
Same group that makes it almost impossible to get a set of similarly colored Transformers of the same size class released in store, so that a "combiner" figure (where smaller figures combine to make a bigger robot) usually looks like he dressed (painted?) himself in the dark. Was the original guy six lime green and purple construction vehicles? Too similar; kids and parents can't just read the product to know they are different. ¬_¬