64,6 % people click on Google advertisement before buying the product. (Wordstream, 2016)
The amount of advertisement has increased rapidly during the last years which caused common users of the Internet to basically ignore advertisement. This phenomenon is known as the banner blindness.
Nevertheless, 2 out of 3 people who are looking for a product click on Google advertisement before making a purchase. That is why PPC campaigns still remain one of the most effective channels of promotion.