Although I agree with the sentiment, I think its not necessarily correct, if every Show HN is upvoted regardless of what you think, we can end up with a situation where we have a bunch of Show HN links in top 10 which are nothing except the person putting themselves out there. Maybe this is not a possibility with the standard of the HN community, but blindly upvoting for the sake of someone putting themselves out there seems a bit crazy.
This is a very real possibility but my logic is that not everyone will up vote every 'Show HN' post, and assuming the number of 'Show' posts doesn't increase at a rapid rate, it should hopefully stay within reason. Of course, this might just be me looking at HN through rose tinted frames. The last thing I'd want is for the front page to become spam. My hope is to only get more people to support their fellow hackers, not to ruin the community.
I fully agree with that sentiment, and I apologize if my comment was in anyway taking away from the article, I do support it, but I think for my own self as a result, I'll make a more noticeable attempt to upvote those that I like.
I often find I'll read a post, enjoy it, but feel my upvote is not really necessary. In that way, I feel innovation and "putting yourself out there" should be rewarded more by myself anyway.