Why is it so many people confuse the free market with "corporations can do whatever they want." Here's a hint. Corporations can charge whatever they want for a product. On the other side of that coin, consumers are free to say whatever they want about those prices, and at retail, they are free to purchase them or not.
In your eyes, the Titan's value was a grand, because if it wasn't, you wouldn't have bought it. In your eyes, the 780 may be worth $700. In my eyes (and indeed, the eyes of large number of people) it is not. I am free to not purchase it at that price, which I won't. I am also free to discuss the price with my fellow enthusiasts. I am free to attempt to influence others with my thoughts on the price. A great deal of demand is based on perception. As an enthusiast, I, as I am sure most of you, am often consulted by my friends and peers with regards to computer purchases. When they ask me if they should pay that much for a 780, what do you think I will tell them? Consumers have more power than you think, and corporations know it.