> The fact that people are buying Dogecoin simply because it is a fun internet meme kind of flies in the face of people who still view the price of financial assets as mostly rational, value-based prices, ...

I don't see anything particularly unique about all of this. They buy dogecoin because they value the dogecoin more than the asset they're using as payment. That's how all purchases and trades work. You're just pointing out that the reason people value dogecoin more than the money they spend for it has to do not with something "essential," like buying food to stay alive, but rather for entertainment. The way you phrase things is making the concept sound more unusual than it actually is.