In the Community ad section on the homepage there is a section for Community ads, hot questions and a few SE ads:
However I noticed that pretty much all I see are hot questions. While I am interested in the hot questions, I'd prefer it if they weren't shown as much (after all, a list of them is displayed right below the ad). I went a whole 12 reloads without seeing a community ad. The second time I tested I went 30 reloads without seeing a community ad and eventually gave up.
Is this really the way it is supposed to be?