I think one of the hard forks made witness votes decay over time, maybe that could be done with autovoting too?
Thats a really good idea!
I would say that I am in a 4th bracket.
Votes from me is automated, I follow a project trail to support people within that project. Because, I really don't have any time to upvote and read alot, but I do check-in DAILY and I do read comments and upvote comments manual.
Not sure if it makes a difference xD