I totally disagree with voting like a fool when you first get here. Like you say above - if the minnows all gain by only a small percent - the rewards are big. I just wrote this post and I'm sending it to everyone who votes on my posts at less than 50% power. I will try to get them to vote less and raise up above 75% at least.
There is no reason for this wasted effort of voting at 20% power, and it uses the blockchain for no reason. No one cares about a .000 minnow vote. But even a .001 vote will grow over time.
Plus, people need to learn voting skills from the get go. I'm on a mission lol.
