In my opinion, the number one reason people fail in network marketing is that they don't realize that it is all about the give and take in relationship building.  You need to listen more than you promote your services/business and keep in touch with interested parties, gently.   Network marketing is a commitment to attend as many meet-and-greets as possible as most of the time it takes 5-7 (so I've heard) meetings to create a foundation of interest and trust.  It is not an overnight sales win 99% of the time in my experience. 

FYI - Network marketing to me means Chamber meetings, Rotary clubs, meet-and-greets, etc, not MLM.