I don’t understand why there are not enough sites making the space available. Do you mean that no casino websites join popinads program?
On the hand, I just send email to one website which has Popin Ads service. They explain detailed to me how Popin Ads works. They also show their another webpage called paypopup.com which has the high rating ar Alexa.com.
Do you think I can purchase the ad campaigns in this company? Thank you for your opinion 