Definitely some good points @taskmaster4450.
Aside from just the "financial success" issue, I'd also say that writing quality comments has a long-term impact here, in the sense that this community is ultimately trying to establish itself and grow as a social content venue... and "social" doesn't amount to much (or look attractive to potential newcomers if there isn't any interaction.
It also makes more sense to "interact well" with content that really appeals to you-- and build a following around that, slowly than just blasting "nice post" on the next 500 items that come through the "new" feed.
I can't agree more...the ones who post the nice post fail to add a lot to the site....people really need to consider the long term ramifications of it all...
Commenting helps the author, the site, and the one commenting.