Ok, i did pay to get traffic from PTC sites (in fact i used one of the numerous 1$,2$ per 1000 Unique hits service floating around in DP) for on e of my blogs on blogspot and my adsense account is suspened Are PTC sites evil ???
I don't think the traffic is illegal but google might not like you advertising your adsense site on PTC sites. Google is also very strict when it comes to putting ads on sites that offer incentive to its users for clicking ads so there you have the answer
PTC sites = means Manual/auto SurfSites where people get paid to browse other people ads . If this is what u mean YES its prohibited by adsense I believe
It's not crap if all you want is random visitors to your non-Adsense using site. However, artificial traffic is explicitly against the Adsense program policies and results in invalid clicks: From the Adsense blog: It's better to spend your money on advertising, because visitors choose whether to click on the link to your site or not.