RE: When your posts keep earning less than $0.03
Both posting and commenting are necessary to getting noticed here. Some of those people you commented on their blogs may visit your blog to see what you blog about. Some may even want to support your post, but when they get to your blog and not find any recent post, you may not get such support. Though it's very discouraging for someone to create a meaningful post and not get anything. You can't even tell if anyone even showed interest in the post. This is one of the reasons why the view counter should be brought back. Even if your post don't get payout, you can be able to tell if people showed interest in it by noting the number of views it generates. Most writers won't care too much about post's payout if they can be able to see their post's view count.
"Some of those people you commented on their blogs may visit your blog to see what you blog about"
I do this, when someone leave a comment I often pop over and take a look at their blog. Maybe me saying Stop posting should be changed to reduce your posting :-)
You're right. Someone that hasn't gain ground here can reduce posting and concentrate more on commenting. Most times i get more from commenting than from posting : even though i try to make my posts as informative as possible, they still don't earn much.
if commenting pays and is in the long term interest of growing the platform and their accounts, I do think its worth considering, but some people are here to post and we have to respect that too