If Corey didn't like running this service, then I'm pretty sure he wouldn't.
And, back to your question about the ads: If you don't place the ads on every page, you are risking your account being suspended for a certain amount of days or terminated (deleted) if the problem persists. You don't need the ads on pages that are password protected so that you are the only person who can see them, but you might want to put them up anyways.