Here is a cool way I use to track banner impressions and clicks on your site using google tag manager and bit of elbow grease.
How we can improve ecommerce tracking in google analytics with a hybrid browser / server approach. Some thoughts on making order tracking more reliable.
Here is a step by step guide to make your Google Analytic reports more accurate by excluding internal traffic in Wordpress. A sample code is also included.
Google Analytics is not just a traffic reporting tool but a centralized hub for all marketing & sales data. See where GA is heading and some ideas to benefit from.