Hundreds of thousands of businesses advertise on Google AdWords yet 80% of Google’s US revenue comes from just 1.5% of the advertisers (large companies such as Amazon, eBay, BizRate, etc., source: SEMrush).  This means just 20% of Google’s ad revenue is derived from the rest of the planet… small, medium and large sized businesses.  Whoever said the Internet is a level playing ground and with that goes the 80/20 rule!