Drinky beat me to the eloquent refutation of gamergirly's rant, which is good, since it saves me a whole lecture on supply and demand. However, I have to add one more thing, since I'm getting REALLY sick of this lousy "since it didn't sell out and Sony said it was going to sell out, PSP is a failure!" argument.
To be blunt, you -- and many others -- are guilty of taking a statement at face value, and it makes you look increasingly dumb the more times you repeat it. Just because Sony SAID "we expect to sell a million units in a couple of days" doesn't mean that they EXPECTED to sell a million units in a couple of days. As a company, you make those statements to create a product image in the minds of the consumers -- "this thing is HOT, it's going to be RARE, and if I don't buy it right now, I could miss out" -- to help stimulate sales. The series of media articles about the PSP trumpeting it as a hit are also designed to cultivate this image, and I expect it will pay dividends. I find it extremely hard to believe that Sony would ACTUALLY discuss the details of their business plan in the press -- their actual projections and break-even criteria are closely guarded secrets, I'm sure.
Oh, and by the way, this kind of approach is Marketing and Sales 101 in plenty of other areas, not just videogames. Since you're probably 13 or 14, you haven't bought a car, but when you do, you'll hear the salespeople say the exact same thing to you when you wander onto the car lot and say you're "just looking around." They will try to tell you that your model of choice -- even the exact car -- is "very hot right now" and it's been "tough to keep them in stock." Mysteriously, "someone was just looking at that very car this morning" and "said they'd be back later." The goal is to convert interest into a sales, preferably based on impulse since the more you think about ANY purchase, the more hesitant you get.
I do have to add one more thing to the whole supply-and-demand topic, since I really think you DON'T understand how it works, no matter what you claim. Bitching about the price is a red herring. It has been shown throughout history that you can command a premium price for an item if you have a premium brand, and that is EXACTLY how Sony is trying to be perceived. The iPod is STILL far more expensive than the PSP, and Apple is selling a metric fuckload of them. Why? Because iPods are seen to be "worth it" by consumers. When you can change the terms of the debate from "X is so much more than Y, which does more or less the same thing" to "buying X is worth it because it's so much better than Y," then you have largely beaten the price game.
Finally, you can save your accusations that I'm a "Sony fanboy." I have a very clear bias, and it's against people who don't think before they start running their mouth. But I will say this -- reading through a lot of threads on the Gaming Forum these days, it's usually a good bet that the truly stupid posts come from people with Nintendo-themed avatars or usernames. But, you know, that's anedoctal evidence, and I'm sure it doesn't MEAN anything, right?