It's interesting how HN crowd are mostly text (and text with low formatting too!) consumers. Compared to other social media, and even old school forums...
Are we mostly l33t developers here, in love with CLI and Vim? Ha!
Same reason I never click on YouTube links from friends: I find it annoying to have to wait to find out if I'm interested or not. On the other hand, I'll click on any non-video link someone sends me to have a look.
I for one never ever click on a video link here. I suspect I'm not alone.