Online business - Make money with internet

I got an email from a person named John reese, telling me that 99% of online marketers make one fatal mistake when getting traffic. Do you know what the fatal mistake is? its simply the mistake of not tracking back where your traffic come.

I also read an e-book about adsense before and its telling the same thing, You need to keep your site statistic as your buddy. Check them everyday to maximize your revenue.

For example, if you run 3 adsense unit on your site and you get $1000 a month, You are already happy with that but you still dont know that the traffic that realy makes money only 2 or 3 referrers only. Get to think of it, You’re not just wasting the opportunities of getting more revenue by filtering useless traffic, but you also loosing money by that when you spending money to get useless traffic.Hmm… Thinking and thinking again., I made my desision to cut traffic from some site that just crowd my site with traffic but doesn’t give much revenue to me. Headache.. Headache.. Iahk2.. I better think something else instead..