I think they're mostly about humour, but there's a non-negligible part of “yay Eliezer Yudkowsky!” thrown in.
It's a castle of humour built on the foundation “yay Eliezer Yudkowsky!” It's a very elaborate castle, and every now and then someone still adds another turret, but none of it would exist without that foundation.
If you know more Eliezer Yudkowsky facts, post them in the comments.