Crazy drawings should have legs because art needs a serious mean to escape from the down-to-earth, material world approximating to reality.
If funny art was easy, everybody would do it. To some extent, the list of one's preferred metasyntactic jokes is a cultural signature.
Art is much of what surrounds us in everyday life. Just painting a foolish picture of what you see.
"The picturesque is located in a space between the grand pretensions and enthrallment by the beautiful."
Francis Picabia, What did ancient people look like?
The enigmatic nature of cherry tree leaves that dwell between the weird and bizarre.
Happier than a foolish duck, art imitates life (aluminium plate etching).
Black and white easy things to draw that look cool or artsy.
It seems reasonable to assume that more humor leads to increased attention leads to better images. But it's not entirely unreasonable to suppose that good pictures are much more likely to be funny, in effect reversing the cause and effect.