The philosophy: that you are not paid by 'the quantity of traffic you get.' (I know maybe 'traffic-quantity' is a factor in SE rankings, but ... THOSE aren't the point of having the traffic either!) The reason you want 'more traffic' is often simplified to "more traffic = a better chance that a visitor will buy what you're selling"; but there are several other factors involved than just 'how many people see it'---how valuable the product is (usually what kind of need it fulfills) & how well you communicate the worth of your exchange. One possible strategy I might employ is ABSOLUTELY NO PAID-TO STUFF. Whatcha think?