People are either good or bad for us. The neutral or the harmless ones are the best, who have no impact on our life. But here you are gambling with life, there ain't anybody who has no impact on you...I mean you either affect or get affected, and in both the cases you have to bear the changes whether for you betterment or the other way round, but change is a change...But .....excess of everything is bad, and believe me it is.
Sometimes it seems that everybody is good for you, but it does not mean you have to keep a collection of all that positive energy sources in your life. Sometimes they may even resonate, at other times there may be destructive interference, but it is all a random thing which is out of our control then.... Final aim should be to maintain a positive energy source within yourself rather than searching it in outside world. Analogous is the logic for negative enrgy souces in your life. And also keeping same number of positive and negative energy souces never brings neutralism in your life, it just captures most of your time, giving you very little time for yourself...