One of the most important aspect of making your business successful is making sure that it has a good advertising agency to make sure that your product or services will look more appealing to its consumer.
So how would you advertise your product or company? How are you going to reach out to a wider audience? TV? Radio? Internet? These three are the major media that you can use in advertising, but how are you going to use these media appropriately?
Making your product appealing to its consumers/customers is hard. I think this job should be done by the expert that's why other companies really hire professional advertising agency. A good advertising agency will make you products known and will help make your business successful.
So maybe the advertising aspect is not your thing, so give it to the the professionals-- hire an advertising agency.