A recent MarketingSherpa report shows that more than half of online sales at high-growth e-commerce sites come from search engine marketing (that includes PPC and SEO). Here\’s a quote:
According to MarketingSherpa 2006 study data, high-growth ecommerce sites get 19% of their overall traffic from search engine optimization (SEO) and 32% from paid search ads. That\’s 51% of ecommerce site traffic driven by a handful of search engines.