Who you gonna call?

This scene has always struck me as odd. I mean if I was walking by this store for rent on Union Street would I really call the broker over the owner? Why would a broker put their sign over the landlords and not ask the owner to take theirs down? What would compel me to call the broker over the landlord? Does this make the broker look bad? I mean it doesn't make them look good.
Commercial spaces are emptying out left and right in Carroll Gardens and Cobble Hill and i just don't see how this kind of advertising is advantages to anyone.