The bad bad bad thing will happen is your website will got banned from google search engine thinking about it how much visitor you will loose if you keep use pay-ads. I’m not joke I was used them for around 2 month in my forums and when I checked google has banned my url from direct access and give warning to our visitor with words like this:

This site may harm your computer.

Now we all know, google hate pay-ads and if you want to keep your visitor grown stop using pay-ads, still there another CPM network clean and available out there.

Note: For every website owner better remove pay-ads now and waiting until google remove the ban.

Benefits Summary:

• High CPM Rates
• Brand Name Advertisers
• Absolutely no ad-serving fees
• Nonexclusive contract
• 100 Fill Rate %
• Wide variety of different ad units
• Live statistics reports on demand
• Dedicated sales force working for you
• Superb phone and e-mail support
• Fast payouts by check, PayPal, or Wire

AD UNITS

• 468 x 60 Banner
• 120 x 600 Skyscraper
• 160 x 600 Wide Skyscraper
• 300 x 250 Medium Rectangle
• 728 x 90 Leaderboard
• Pop-Under
• Interstitial

Publisher’s site may contain multiple ad units per page so long as they do not repeat.

Example:

Publisher’s site may have one 468 x 60 and one 120 x 600 running on the same page. A site may NOT have two 468 x 60 ads on the same page.

I always try to join on some big CPM network but in result I always fail, I don’t know why maybe those network asking about my site quality. At least I found Globalinteractive and sound like they’re serious and legitimate, they asking my phone number for verification that’s make me half trusted on them.

Site Requirements are easy to follow, you can read also Quality commitment.
If you’re interesting you can try to apply it from here.