Don't just look at the cheapest thing to buy. There is this Transcend MP330 MP3 player that is selling there for 1.7k. Apply the coupon and you get it for 1.5k.
It's a sweet deal considering that the price of the player is lower by itself and the coupon makes it even better.
So, you cannot say that the coupon is not worth buying solely based on the lowest priced item...