It's a problem with social networks in general, and largely, that's what hubski is, because it's the overriding paradigm of how people interact outside of imposed structures. I see a follow as a way of ensuring that I see the content of a user who has proven to post quality content. If a person has good content, they are going to get more followers, although there is a certain inertia that builds up once users have large numbers of followers. To make an example, a person might follow mk, because they feel that they should, rather than because they want to see the stuff mk posts. I'm not sure how that could change except by maybe adding a prompt to the follow mechanic that just says 'Following this person means that you want to see their content, don't follow just because' which I doubt would actually do anything.