Is Paid Traffic Overrated?

It seems like there is always a catch when it comes to paid traffic. The cheaper ones like 7search and PPV sites get you a lot of clicks but no conversions and the expensive ones like Google and MSN get you better quality traffic but the average click costs between 2 and 6 dollars, so if you are making 40 dollars per sale, you have to get 1 sale every 20 clicks to break even if we are talking about the 2 dollar clicks and not the more expensive ones. Is there anything in between where you can make a few sales without paying so much per click??