I had a similar experience. I wrote an app that helped parents choose a name while my wife and I were expecting. I thought I'd see how admob performed, so I put

I had a similar experience. I wrote an app that helped parents choose a name while my wife and I were expecting. I thought I'd see how admob performed, so I put some unobtrusive ads in. You might expect with the keywords that I was sending, oh I don't know, ads somehow relating to parenting? When you're a new parent you have to buy a ton of new things. What could be better for advertisers? Not a single ad in the app's entire existence ever targeted anything to do with the app's audience. The most common ad that I saw was for gamers. Trying to enable local ads didn't help either, the same ad displayed over and over again for a spa -- over 200 miles away. Needless to say, the advertising barely paid for the coffee that I drank while developing that app...