Here's your proof [1] - 250 ETH, or almost $100K. I must say that the kitty in question is pretty cool [2].
You're free to believe in what you want to believe, but to me it's pretty obvious: the $3M that circulated in the CryptoKitties over the last 5 days is real, and certainly not from people laundering money.
You can also hang out with the devs and other hard core users (investors?) on CryptoKitties' Discord channel [3]. Some surreal but fascinating conversations.
ps: to offer a different perspective: I bought a Gen0 cat on Sat for fun; today the cheapest price is 3x. Not sure the future liquidity of the kitty marketplace (particularly if it crashes and burn, like Pokemon Go, which is very likely), but some folks are rushing to it like an ICO boom.
[1] https://twitter.com/nicksdjohnson/status/937596285917548544
[2] https://www.cryptokitties.co/kitty/101
[3] https://discordapp.com/channels/387021283503636500/387024670...