@pamm I think that that is a consequence that naturally happens when you start to have big numbers of followers. Then, naturally, you can't keep up with the number, can't follow 10k people, unless that you dedicate your whole life to Instagram.
Successful instagramers have big numbers of followers= for instance they have a lot more followers than people you follow= then some clever guy/girl make the connexion and conclude "well if all successful instagramers have more followers than "follow" people, that has to be an important requisite".
Only that is not. Is only a natural and organic consequence that happens when you grow up too much. Is simply a good sign of your follower healthiness.
I don't think to not follow people only for the sake of the rate is important or even a good thing. If I'm interested in someone I follow then no matter the rate he/her has. Don't you?