It's not that nothing gets through, since people are obviously getting ads through. You just have to have the patience to go with it, and the people who get stuff through each have their own unique "tricks" or strategies to doing it. In my personal experience, having a rep doesn't help you get stuff through for shit, but that probably depends on your rep. Anyways, chances are that someone who IS getting stuff through will NOT tell you their strategy, because if everyone starts doing it, they'll start failing, too.