Not starting a new topic, but here's a little branch coming from this idea. Instead of having advertisements for everyone, only have ads for non-registered users. For example, all the people with "newbie" as their names, or the ones with those faces. Then, as soon as they login under the GLS on Paintball, the ads go away.
Another idea - someone already said, i think, is too actually have the Advertisement Logo's fixed into maps, although, this would probably mean rebuilding total maps. Which could be a big problem.