Not many people know that if you use AdSense on your site or blog may not use traffic exchange sites to bring more visitors. Google is so serious about it, that they can even terminate your account.
I personally do not see any problem with it, but I suppose that someone in the past found a pattern to get more clicks by using the traffic exchange sites. For one of my sites I use only the traffic exchange sites to bring visitors, now the site has 30.000 unique visits, and I'm use AdSense, but I got not even one click.
And if you plan to make money on AdSense, do not use traffic exchange sites, because that will never make you money. This is because these people are there because they must, for getting credits that they can exchange for visits to their website or blog. They are there only while the timer is out the specified time, and immediately moving on to another site, so that visitors are not targeted and they are not make action, so it is unlikely to click on an ad.
It is better to use other ways to bring visitors to your site, such as social sites, but it is best if the visitor came from Google, because they make more action, and they will most likely click on an ad and Google support that and highly recommend.
So it is best if you have AdSense on your site that do not use traffic exchange sites, to avoid liquidation of your Google account.