Just out of curiosity, what's the average PPC for CoinURL? Is it a lot lower compared to Adsense?
I had the default CPC set which was less than a penny, But I set it higher so it's about 5 cents right now. Compared to adsense which can vary from 1 cent to a $1 depending on the ad. My reason for switching from AdSense to CoinURL is I thought maybe it would bring more clicks, since the ads are more relevant to the audience, But so far it's about the same 1 click to every hundred visitors roughly.
The issue here is that Bitcoin sites are catering to the more technologically minded people. This means we are trained to ignore ads for the most part. Really, you'd have the same issue with Adsense for the same reason, though.