Over the Easter holiday period it appears as if a few of the adwords advertisers dropped out of the market we are in. As a result we had two sites that got a taste of the "actual" top positions for a few days and the spike in traffic was better than decent. On my rough numbers it's about a %40 jump but there might be some seasonal factors in play as well. The point is that even with great organic results your still missing out on the real volume in a lot of cases. #1 is actually #4 and with the highly variable adwords content sitting at the top of the searches Google traffic referrals might change a lot more from day to day than you think.