Why it is important to market yourself:

It is important to market yourself because it gives whatever you have to say or whatever it is you do a better chance of reaching your intended audience.

If you are selling something, then you want to communicate with the people who will buy what you are selling.  If you don’t market yourself, people won’t know who you are or what you are offering.  

Marketing serves to communicate with your audience and to define your product, whatever that may be. It lets your prospects see that you are unique and that you are the right one to provide what it is that they are seeking.