I have come to realize that all of us have different points of views on all sorts of topics. Just because I do not get fatigued by those in my network, I can understand how others are wiped out from the efforts of cultivating their relationships. Sometimes people are just draining to be around.
It is also okay to purge some annoying folks from your life. Come on, you know what I mean...those who you run from when they walk in the room or the person who regularly acts like they are a "giving" networker, but are actually a selfish and insecure poser. We all know them, so the time has come to "just say no" and remove them from your list of friends. You need not like everyone (sorry, you still have to be polite). Cut those that sap your energy right out of your life! While difficult, this action will leave you more energized about the people in your network whom you have decided to retain.