What's worse, out-of-date advertisements or empty frames?

Douglas College advertisements, City Centre Skytrain station, Vancouver, BC

I've written, more than once, about the problem of out-of-date transit advertising. Well, I think that this problem is worse.

Empty spaces just stand out, and not in a good way. Were insufficient posters printed? Was a poster stolen? Or could the people putting up the new posters just not be bothered to finish?

Just another of the million little details that marketers need to pay attention to.