> The real question: is this behavior any worse than the "super serious" parties?

Exactly. In a corrupt political system that each voter has little or no faith in, how do they signal this to others so that everyone knows they're not alone?

You can simply not vote, but then you're accused of being lazy, etc and the overall point is lost.

At least with a joke party, getting a sizeable portion of votes creates an undeniable spectacle to spark discussion.