Replying here due to nesting
I don't necessarily agree that its irrelevant. For example, in your example, another minnow with 100sp might want to decrease that disparity. His vote would be infinitesimal either way, but it would have 6000 times the effect if he downvoted the 1m post than if he upvoted the 100 post.
idk about UBI, but i do believe that a wide spread acceptance of the downvote as a valid means of redress for overvalued posts is the only way to get there with a feasible amount of steem power.
especially if it was big dolphins or little whales doing it, it could have a big impact.
I actually was origninally going to post a somewhat detailed model of the math here, but it was so long i made it into an OP.