Real answer is: Because they can. They will always rape people's wallet. They will give it to you the way they want it. You can thank whoever came up with this pricing scheme. Apple's motto is: You buy it or buy from someone else.The real question, is why Apple released the 32gb in the first place... Base model storage should have been 64gb, but that would have eaten into sales of the 128gb model.
20-odd gig of space on a "pro" device... Sigh.
The funny thing is...people can't survive without iPad...or any apple products.