iOs - iAds availablity, How often does the iAd server not have adverts to return?
I was wondering if anyone who has used iAds knows how often there are no adverts to return

We are debating using an alternative advertising platform when we get the 'no ads' delegate callback

    - (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error
    {
          if (error == no Ads on server) {
                  // Load alternative advertising platform
          }
    }

If anyone has any experience, views or links to usefully sources it would be great.
iOs - iAds availablity, How often does the iAd server not have adverts to return?
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I was wondering if anyone who has used iAds knows how often there are no adverts to return

We are debating using an alternative advertising platform when we get the 'no ads' delegate callback

    - (void)bannerView:(ADBannerView *)banner didFailToReceiveAdWithError:(NSError *)error
    {
          if (error == no Ads on server) {
                  // Load alternative advertising platform
          }
    }

If anyone has any experience, views or links to usefully sources it would be great.