That's a good question. There are many potential answers, but instead I'll ask another: why does still upvoting bother you with comments not but with other posts?

As for "even if you believe in yourself, you can still be a total shit.", I'm not sure what you're implying here. If it's that my (and others) value of our work is potentially "total shit" if it's not acknowledged by the upvote of others... I'm not even sure how to respond to something like that. Couldn't the same be true of someone successful?

Also, I did not imply that you got anything handed to you. Disagreement about potential rewards is fine... My issue is that you seem to have a problem with someone rewarding themselves at all.

I'll give a second answer to your question: because the way Steemit is currently organized there isn't enough attention to go around. Posts get little, comments get almost none. If you're not willing to correct this in your own comments section with your upvotes (and who could blame you), then why do you begrudge people who will rewards their effort and insight? Let's make the conversation about quality comments versus crap ones. Do you really rewards every comment (or post, for that matter) where you find quality? No. It simply isn't possible.

You make good content. It's a shame we seem to have a hard disagreement over what the worth of someone who contributes to the culture of that content is.