Go back to the original Apple II and subsequent products, they were per memory and Wikipedia all made in the US until the late 1990s. The IBM PC was originally manufactured by SCI Systems in Huntsville, Alabama.
What a lot of folks don't seem to understand about "third world factory economies" is that the prototyping and initial product runs are still frequently done in the west. Some EMS companies, like Flex, even have hardware incubators in Silicon Valley (google "Lab IX" sometime); all of them offer JDM & ODM services, too.
Paraphrasing, I think the point is that writing a book and building an iPod are vastly different tasks, and immensely so. A better criticism to what e12e was trying to imply is perhaps that Rowling certainly wouldn't be rich if it weren't for a network of publishers. Like Jobs, she depended on other people for channeling the income she received to her. (Of course, the difference in how that happened is still huge.)
That's not to say American manufacturing would cause the price to double, just pointing out that where you manufacture something is an important part of the product planning process.