I think it is more important to have a few followers that actually read your hubs than to have lots of them that aren't really interested.
I read a few hubs each day and comment on the ones I find interesting. I like to read hubbers I am not familiar with, expand my horizons. I participate with questions, comments, and to a lesser degree, forum. I gain a few followers each week.
I only follow others if they have several hubs I enjoy. I hope they follow me for the same reason.