I use my vote to support the good people in their posts and comments. I mostly just flag spam comments, but I've done some posts that mis-use tags.
I've seen some people who do 'nice post' comments and give themselves a big vote whilst giving nothing to the post. That's a very cynical money grab. Some are too big for me to risk getting into a flagging war. I'd hope some whales will support bots who deal with that sort of behaviour.
I've delegated some of my SP to people I trust to use it well. I'm not too worried about losing some curation rewards. I don't tend to give much of a vote to posts that already made a lot. I want to see the rewards spread to more people.