As you stated I do believe it is really helpful for minnows to get some exposure since many people only read posts with "some bucks on them". On the other side I really would be in favor of a max. amount (in $ lets say 50) on upvote through a bot on a single post. Whales easily buy them 2-3 30 SBD upvotes resulting in $150 upvotes and then trending and or hot. Again on the other side there richness doesn't come from nothing so why shouldn't they have the same right no matter how rich they are.
Real difficult topic in my opinion.