Sounds like a formula to stay at the bottom. You should go read the material on keyword density. You may be a few months out of date dude.
If you mean to say that you have earned 4usd from a single click, then i don't think there would be any one who is willing to shell out 4 USD for a single click. And if you mean to say that you are spending 4 USD for a single click, them please let every one of us know about your business.
There are several such meaningless posts. We should report such posts to Moderators and get rid of such spams.
Listen folks, please report posts like these from people who can't even figure out which particular forum to post in, I know I'm flagging posts like crazy. In relation to this post my 2 cents: I've had plenty of clicks (adsense) that I've made over $10 on, you need to do a little research on what people are paying for. A couple months ago it was foreclosure and bankruptcy and these keywords and keyword phrases are still pretty pricey. From an advertisers standpoint I would never pay 4 bucks for a click. heck I wouldn't even pay a dollar for a click, but that's just me. I prefer organic search results.