Non-banner ad questions...

Hi, I've got a really simple iOS app that I'd like to make/release (I think it'll take ~10 hours to make.)

Unfortunately, my iOS dev membership expired, so I'm not allowed to release anymore. I'm doubtful that it'll make enough money as a $0.99 app or a banner ad supported app, but I've been curious about other ad formats. My app will run for long periods of time. Input will be through a single button or the mic, which will listen for loud clicks indicating the user wants to hit the button but for whatever reason can't, and output will be through the speakers. So I think this lends itself to other ad types.

Types of ads that could work...
- Cover the full screen.
- Play a movie.
- Audio only (like radio ads.)

Does anyone know of an ad network I could use to get these types of ads and that would pay much better than banner ads?