No. Most of the posts that make "best nodes" are too advanced for me to understand. I try to read those that I have a chance of understanding to profit from them. But if there is a node I think deserves downvoting, I will do so, wherever I find it.
It takes quite a lot for me to downvote a node, so looking at nodes that have been so heavily upvoted as to make best nodes means that doing as you describe is likely to be a total waste of time. I don't think it's a waste of time to try to ensure that people aren't discouraged from saying "thank you", so I try my best in that regard. But please don't get the impression that I haunt "worst nodes" for things to upvote. That would really waste time.