It makes perfect business sense since demand still outstrips supply. Some people will think of it as price gouging simply thing that AMD is raising prices because they simply can. Yes, price is driven buy supply and demand and the "right price" is the highest price the general consumer is willing to pay, but have products fly off the shelf. But there's more to the story...
I am actually glad that AMD is raising their prices (who else is with me on this?). Due to the lower than expected yields at TMSC, it costs more for every single 40nm GPU to be produced, thus cutting into their profit margin. People need to realize that it cost tech companies 100's of million on R&D to develop a product, then more money to manufacture the product and even more just to run the company.
The extra $20 per GPU will allow AMD to earn a profit or at least decrease their losses. AMD has been loosing money hand over fist so they really need to bring in money. The alternative is being inched closer and closer to bankruptcy.
AMD is not as big or as important to the overall US economy so the US Gov't will not step in to save them. They are not AIG, GM or Citibank, they will be allowed to fail. In the worse case scenario the bond holder (a.k.a. Bond Bullies) will swoop in and start sell pieces of AMD left and right to re-coup that massive amount of money they lent AMD over the years. Bond holders trumps stock holders (unless the Federal Gov't decides to change the rules, which they had done so before [idiots!!!]). The end result means Intel will be the single manufacturer of mainstream CPUs and nVidia will be the only game in town when it comes to performance oriented video cards.
Just keep in mind that AMD is doing this survive, not to take advantage of the consumer.