Recently, there has been more grumbling by studios unhappy with the flat 99 cent pricing structure of iTunes. They want to be able to charge more for more popular music. That is, squeezing us for all we're worth.
Which leads me to an interesting thought... what if they made the pricing completely fluid? As more people bought, the price slowly increased? And as a song sat on the virtual shelf, unpurchased, the price would slowly drop?
They could take it a step further and only offer a limited number of copies of the song. That would, of course, be evil.