Why it is important for a brand to have brand evangelists?

In my opinion, these are some of the reasons for brands to invest in, nurture and cultivate brand evangelists.

• Your marketing team cannot keep brand conversation going on beyond a certain point in time; your evangelists can.
• Evangelists are the people who personify your brand. 
• Founder and the evangelists are only two people who carry a brand's message in their heart, every time. They are your PR / Sales team that never ask for commission or monetary compensation. 
• They are the only people who "get it" and love you do. 
• Evangelists are your "unfair advantage" over your competition.  

Creating evangelists is a whole new debate. But for this question, just imagine having a lot of Guy Kawasakis out there in the market and showing love and passion for your brand.  

Becouse those evangelists are true customers.They can support Your Brand and they can increase the awareness of your Brand, becouse they truly believed in your Brand.