Is Sony even really going to break even at $300? I really doubt it. First, it's got a huge, gorgeous screen. It really is one of the most clear, vibrant screens to grace a handheld device.
Second, it's extremely powerful.
Third, it's packed all that power into a tiny space.
Fourth, a lot of the technology is proprietary to Sony and not off-the-shelf like Nintendo's components are.
Fifth, it has a more complicated medium-reading mechanism since it uses discs.
To actually make a profit, I think they'd probably have to charge something like $400.