'Following' should have some meaning, and indicate a genuine interest in a hubber's articles.
But I'm sure some hubbers have a feeling of obligation that if you 'follow' them, then they must make a token effort to return the favour and 'follow' you. Or alternatively they'll initiate the 'following' process just in the hope that you'll return the compliment.
That does become pretty meaningless if they then never actually visit your pages or comment. So I tend to only 'follow' authors who write about subjects which genuinely interest me, and then I will always comment if I have something worth saying, or at least vote 'interesting' or whatever, because I know it certainly is nice to receive that kind of recognition.
One thing I will do is regularly run through the list of my own followers, pick out a few and just see what they've been up to, and if they've written a few pages of interest to me, then I will read the pages, and maybe then be able to return the compliment and start following.
(ThompsonPen - flowers only follow people in 'The Day of the Triffids', and that's not good news!)