whether or not you're going to play it is beside the point, the game is 75 percent off on all expansions and bundles, so consider this:

you spend 10 dollars on a battle chest. this regularly retails for 40 dollars. after the sale ends, you'll be able to get 4 times what you paid. so if you go out and spend like, 30 dollars on 3 bundles, you'll be able to make 120 dollars. 120 dollars for 30. 

or you could, you know, just play it. :s