Brand Recognition is a by-product of running advertising - Companies that run PPC ads consistently receive more organic, more post ad click calls, & more direct traffic as a result. In fact, Google even takes some data from PPC ads and factors it into Organic rankings (like time spent on page, click through rates, etc.) This is anecdotal, but there is always a correlation when you look at the amount of money spent on ads and compare that with organic traffic to the site. Take this into consideration when you are calculating the impact running PPC ads has on your business.