I see people having fun and satisfying their creative curiosity by making and building upon jokes inspired by this link. Links which link intellect and curiosity are quite often posted to HN.
To answer your question on what have I really learned... well that's not a question you want to start asking. I can point out quite a few articles that don't belong upon HN when held against that criteria. Take for example almost everything related to the NYT. I usually don't click on those and just wait for the blog post that explains the same thing with more information and less filler.
As for another argument that you will find quite easy to strike down, this is not somewhere where I go do to market research, it is somewhere where I go to entertain myself and find things, preferably about hacking, that I may read. This link does a brilliant job of being related to hacking while also being entertaining.