Why Do They Lie?

Why do they say "Stay tuned for more Scrubs!" when they know darn well that there is no more Scrubs? Then I have to fast forward through the last commercial break, confirm that there is no more Scrubs, then delete the episode. Same with the Office. They used to at least give you some scenes from next week, but now it's a blatant lie. But I can't just give up and delete it without checking, because sometimes there is more Earl.