Because many of us think simonw has discerning taste on this topic and like to read what he has to say about it, so we upvote his comments.
Not saying this is the case, but it's what the comment implies, so "just upvote your faves" doesn't really address it.
I would like to see others, being promoted to the top rather than Simon’s constant shilling for backlinks to his blog every time an AI topic is on the front page.