The last principle of our online marketing basics: never lose sight of the return on investment (ROI)! There is a simple calculation if you want to run a successful business: the benefit of an advertising measure must always be higher than the costs incurred. Online marketers use a special indicator to work this out – this is the return on investment. The ROI is used to measure the return on a business activity by showing the profit in relation to the capital invested.
Although this article has been written in 2007, now in Feb 2014, I still find it full of great advice and tips. What I learned from this article is that when writing a review I should focus on how this product helped me achieve X instead of simply repeating and enforcing the features and benefits of the product that can also be found on the sales page.