And on an appropriate forum with as many readers as SO/SE you'd likely get well-thought out responses going far into detail regarding purchase cost, habitat maintenance, prevalence of skilled keepers, etc. Someone who actually was deciding whether to add a Gorilla enclosure or a shark aquarium would find it a very enlightening post.
I understand you created SO/SE and want to see it move in a certain direction, but closing and deleting questions you don't like because it threatens your "science-in-the-small" goal is, I think, a terrible way to go about it.
(FTR, I understand Jeff is not personally going around deleting stuff on the site)