Why Record Labels Fail

I was browsing the CD racks today when I noticed that Beyonce has released an expanded edition of the same album she released earlier this year. It has 4 new songs on it. Honestly why do they this to the fans? Re-release the same CD that they released 4 months ago with some new songs on it, so that you have to buy it all over again. It's one thing to (years later) re-master and rerelease your CD with some cool bonus tracks on it. But to do it within the same year? Short term greed = Long term failure.