That's a pretty remarkable price elasticity of demand, and it kind of makes me wonder about the rationality of the purchasers. If a game costs $50, a 25% cut merely saves you $12.50 -- that is enough to more than double revenue? Odd.
It was a special case, as the "Left for Dead" sale was featured on major online social news outlets. So i think it is not at all representative for the general case. But the article contains data about the general case, and they are encouraging : 50 percent sale = 320 percent increase in sales.
