I think if people focus on commenting on content that they actually love, or that moves them, it will show in the comments. There's pretty much an infinite amount of variety of content to consume on Steemit which is why it's so great, so anyone can find something, somewhere on this platform to comment on in a way that makes the community better. When commentors / curators seek out content that they love, that really grips them, I think it will show in the comments, and Steemit becomes a win-win for everybody.
That is indeed the ideal world and the ideal I follow here on Steemit (and the internet as such, actually), but all these people trying to make fast bucks are not really with it.
But we will have to keep doing what we do, right? :)
I agree with you about commenting on content you love. If you love something, commenting on it will occur naturally and be more organic and sincere. You only have to find the content you love on Steemit.