Umm... Err... Hmm...
I was kind of hoping that the "JK" on the Joker stands for "Just Kidding..." But at $36 a pack, even with the interesting interlocking feature, it's an easy pass.
They're not even "playing cards" - more like "playing slabs," except perhaps in China, where I'm told that the same word is used for both "card" and "tile." Y'know, like mah-jongg tiles...
They're a complete and total novelty. Not saying a novelty is a bad thing, just that it's a lot to spend on a novelty. Then again, if the Pet Rock came out today instead of in the '70s, it would probably cost this much...