TO FOLLOW OR UNFOLLOW - THAT IS THE QUESTION?

More and more as I participate in TWITTER, I wonder about how people determine whether or not to Follow someone. I have realized who the spammers are - they're the ones that don't have any tweets, or the ones that have the same tweet, over and over. Don't follow those tweeters!
But, what I have wondered about are those folks who use Twitter a lot, tweeting about their lives, or their aimless thoughts and actions they feel others want to hear about. The people I wonder about are those who don't FOLLOW but only a few other Tweeters, but yet they have lots of Followers. Are these folks are interesting? Or do they think they are interesting?
Do they feel that people want to follow them; but yet they don't repay the courtesy. Do they feel that what They say is more important than what Others say? I am sure they do!

It is true that you DON'T have to follow back everyone who follows you. However, if you have 2,150 Followers, and yet you only Follow 415, what's up here? Are you kidding me? These people who follow you must be of some interest, after all they are following YOU!
As I tweet along they happy road called Twitter, I read postings by fellow tweeters such as MASHABLE or MINERVITY that write about Social Media Etiquette and how to best participate in Twitter. Some report it is best to "join the conversation" to get the full benefits of Twitter!
So are these folks that have lots of followers and follow few more important?
Are they actually engaged in Twitter or do they use it correctly?
I also wonder, what is their ego about? Do they feel that following few people is good for their ego or does it help define their sense of self to see their Followers List grow?
Just some thoughts about whether or not to Follow people on the Twitter!