Beautiful wrietup.
My answer to your question: It does not look wrong to upvote personal comments. But there should be a limit. I read an introduction post by a new Steemian the other day, in it a whale visited. The "whale" upvoted the post with about 20 cents, then upvoted his comment on the post with $5. It looks really discouraging.
You mentioned different categories of steemians. From Authors to Spectators. Some of these spectators want to be rewarded too. It would be better if they post contents and upvote themselves, than commenting a word and giving it huge upvotes. It makes the rewards pool look unfair. Nice suggestion by the way.