If people knew to upvote stories they liked on their own then the average story would have something like 800 upvotes. I agree with what you're saying because if everyone did this it would be really annoying, but certainly most people don't upvote the stories they like.
Sometimes you simply do not like a story, article, linkpassing nearly enough to actually be thinking: "Hey, this was so interesting, that I am going to tell a really good friend about it - so he/she could enjoy it aswell!".
You bet half of the regular Hacker News readership does not know the frontpage is powered by voting.
I bet most of the fellow users have fairly or very high standards. Especially since there's so much quality content.
Just my two minutes of thinking and other eight minutes of editorial process. Cheers fellow reader.
I'd like to hope that it's greater than 50% of people who understand the voting concept, but it would be interesting to see the metrics.
I've removed that special banner. You're right, HN folks know to upvote if they like it, of course, and it's insulting to say otherwise.
In my defense, it's true that I'm an HM reader and it's true that I appreciate the upvotes. :-) But you're right.
Thanks!