After a bit of research..
Starting to suspect coinad and coinurl are not even the same kind of service.
Coinurl is a url shortening service that pays Bitcoins out every time one of your shortened links is clicked. It also provides very useful analytics for every shortened URL.
Coinad, on the other hand, seems like a basic PTC servicer (pay-to-click.) You can click posted PTC ads or pay for your own PTC to display on the site for PTC users to click.
As stated 6 months ago...
forzendiablo was referring to coin-ads.com, which is also a URL shortener, not that PTC site. They are both URL shorteners.