While quite useless as a metric as it seems very inaccurate on the amounts, I wonder what would happen if millions of accounts were automatically fed into it to set a more accurate bar.
Interesting to see the comments per post and engagement %. I think that once more analytics for steem would make the experience a lot more interesting for many users and frontends that do it well, much more compelling.
Post value is a factor, it is purely engagement as far as I can see.