No matter what type of online business you are building, the one thing you will need is a steady stream of qualified visitors to your website. There are many ways online that you can find traffic. They usually fall into one of two categories: slow, cheap and easy, or fast and complicated. Google Adwords tends to fall into the latter category which is why many people would like to hire a Google adwords professional to help them set up and run their PPC campaigns.
Of course, there is another option: you could undergo the certification process yourself and then not only learn to run your own effective Google Adwords campaign you could also charge other people to run their campaigns for them.
