When you pay to put ads online, every time someone clicks on the ad and lands on your website, you have to pay (‘pay per click’). With organic SEO however, there is no charge whenever someone clicks on a link they find in the search results. The fact is, people are more inclined to click on and trust organic listings than they are adverts, which is why investing in a long term SEO strategy for your professional services firm is more likely to deliver a better ROI.