As long as I can remember to, I'll buy that for a dollar! My goal is to buy it for somewhere between a penny and a buck.. And you should too kids. Goo is good for Yoo.
Theres a great article on the escapist about it here. Offer good till October 25th.
Not surprisingly, you make more money letting people pay whatever they want than you do forcing them to accept things on your own terms. But not always as Tobold pointed out and linked to us Camels and Rubber Duckies
I personally think these startegies are great for promos in a dry season, but if you did it initially then you are a fool. And if people know you're going to do it eventually, then it becomes less effective again because they will just wait until you crack so they can get the game cheap. I know I did that with DnDOnline.