This post is a few years old but it is still relevant to uniform pricing as the price wars had only just begun when the article came out. The article is NBC chief warns over iTunes pricing. It was an interesting article having to do with uniform pricing and how big of a deal it is in the media industry. The text mentions that uniform pricing is the least profitable of all pricing measures given. There is no discrimination and the price is just set at a price where the company thinks it will remain profitable and have the highest demand.
The downside to uniform pricing is that it causes inefficiencies in sales and an item that is in more demand will be sold for the same price as something with the least demand. I think Apple decided to do this, and set its price at what it did, because it could. Apple did not need to do as much research for uniform pricing as it would have on complete price discrimination. The book mentions that complete price discrimination is the most profitable but also requires the most research and information. Uniform pricing is great for Apple because if they see that the demand is falling off, they can lower the price across the board and this is much easier than trying to guess which band, or show, will be the next and greatest hit.
Apple did do some research on which price point would be the most profitable and would demand the most from its consumers. This helped them set the price point at what it is set at. In Apple's case, I think they went with the best pricing program that they could have chosen. It was easy to implement and can be changed just as easily.