On the contrary. Just because something attracts money doesn't mean it adds value. In fact, the opposite can be true.
In this case, CryptoKitties purchases represent money that was diverted from intrinsically valuable goods and services: cars, fruit, haircuts, shoes, software, and so on.
Every dollar spent on CryptoKitties was a dollar that didn't go to a farmer, a plumber, or a musician. That's not creating economic value; it's destroying it.
I’m not sure it strengthens arguments for blockchain etc but on a tight economic value add it’s true.