With the previous generation, you got 64GB of storage for $100, not 32GB. I do not see a single reason why iPad Pro starts at $599 since the overall upgrade is smaller than previous generations.
iPad 4 to Air was a much significant upgrade and the price remained the same,
iPad Air to Air 2 was also a very significant upgrade and the price remained the same.
This time around, Apple slaps PRO as part of the name, doubles the base memory which costs them like $2 and jacks up the price by $100. WTF is wrong with them lately???
Also, by dropping the price on Air 2, they made the Mini 4 look overpriced. They should had adjusted price on Mini 4 and eliminate Mini 2 or even further drop the price on Mini 2 to like $199.
Overall the iPad lineup is so jacked up, it is not even funny.
This is what I believe the prices should have been from the start
mini 2 - 199 (16gb)
mini 4 - 299 (16gb)
air 2 - 399 (16gb)
9.7 pro - 499 (32gb)
12.9 pro - 599 (32gb)
I had the iPad 4, Air, Air2, and have the 9.7" Pro. Couldn't disagree more. The 4 --> Air upgrade was basically a form-factor upgrade. That was a big deal, but the speed change was overall pretty small (at least in terms of how the device was used at the time, and what apps were available to harness the available power). In some ways the Air was a downgrade because of the switch to 64bit without the increase in physical RAM. Air --> Air 2 was a pretty good upgrade, but really only for the RAM and TouchID. That basically made multi-tasking a little smoother, but few people saw a need to upgrade. The Air 2 --> Pro update is by far the biggest year over year update we've seen. It got ALL the normal year over year improvements (other than a physical chassis change which was not really necessary) PLUS a base storage bump, significantly better cameras (making an iPad a realistic photography device for the first time ever), plus the digitizer layer, plus the smart connector.
I would not be surprised at all to see the method going forward to be the Pro gets the updates, and then they continue to sell the old Pro at a reduced price a year later, but without the digitizer or smart connector, and possibly with cheaper camera modules and maybe less base storage.
Your pricing expectations are completely out of line with the market as a whole. Go see what $499 buys you in an Android or Windows tablet and come back here and tell me that the 9.7 Pro should be priced the same or the 12.9 only $100 more. You're dreaming.