Personally I vote pretty willy nilly, its hard for me to stick to any sort of plan or numbers. However I never let my vp get down past 60 and I let it recharge if I had a curation frenzy that day haha. I prefer to upvote quality content at full power, and also support newbies with small upvotes regularily too.
I try to balance investing in sp with taking money out for life.
I also dont mind upvoting my quality posts, but never have really upvoted my comments. I agree with you that its up to others to judge my comments! I know for a fact I put lots of effort into my posts however!
I absolutely love this giving economy we have here! It is so natural and so easy in the way this ecosystem is set up. I hope it spreads far into the physical world and we all start to encourage and reward each other for giving selflessly!