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Your score indicates that you have had some strong Hubs which should not be a "bother" to read. That takes effort and actual interest from those who signed up to "follow" your Hubs. Readership will vary as your topics vary from their interests.
6% commenting is a strong percentage based on my personal experience. So many think that by "following" someone else they will make money, bu that only happens (if it does happen) when you actually routinely read some of their latest offerings.
I notice that your 10% equates to 2 who do actually read one of your Hubs "from time to time." If 10% of my declared "Followers" read mine from time to time, I'd be surprised, but happy.
On an average yes, but its not the same ones so ya eventually we will all get more followers and hopefully more readers too.
Accepting that your answer is about how often you read Hubs of Hubbers YOU follow, the question remains as to what percentage of your Followers do you believe read your Hubs from time to time?