What a wonderful idea @dobartim.
I agree with this entire premise. I upvote every comment made on any of my posts that so any sort of effort. Hell, I often upvote the "great post" comment even though I am saying to myself why did this guy waste the time?
It would be fascinating if we could put together a collective list of those who appreciate comments and upvote them. Even if it is for a few cents, that shows an appreciation. Now I understand it is easier for me to upvote all commenters on my post since I dont get hundreds of comments. That said, I see to many with huge SP and reputation who do not upvote anyone who comments.
If someone avoids you and does not respect you, then there is no reason to waste time, we should go further my friend @taskmaster4450