If your company doesn't have a strong sense of brand identity, your advertising efforts won't be as strong as they could be. And, if your business is not being marketed with brand identity, you are missing out on important customer recognition opportunities and potential sales opportunities!
In order to get the most out of your advertising efforts, people should know, at a glance, that the advertisement they are seeing is for your company.
Adding your brand identity to all of your company's visual marketing efforts will give your company brand power - whether it's printed materials, online advertising, tv, or any other promotion.
The more that people are exposed to your brand identity, and your business - as a whole, the greater your brand power will be.
Once your business has brand power, it will start to pick up additional sales because people's comfort level (with your business) will be greater and they will (naturally) begin to start trusting your company more. The more that people trust your company, the higher your sales will be.