我的iOS应用不会请求iAd

I recently released my first app on the app store (August 5, 2014 release). When I was testing the app the test iAds seemed to never go away. Now, the actual app available on the app store isn't displaying any ads. I have read similar question, where iAds didn't work at first, but everyone says they started working after a little bit. However, mine seems unique in that it made six impressions right after it was first downloaded (6 requests, 6 impressions), but it hasn't done anything since. Is this a programming error and that's why my requests are low, or is this common for iAds on new apps? Thanks. Oh, and I added ads using the method shown in this video I recently released my first app on the app sto