This is a Phone after all
Well, I'm not entirely sure why this is a problem or a trait of Apple.
This is very normal for the Telecoms Market.
Take a look at price trend on any high end phone from release to the first few months and you will see similarities.
Apple aren't being original with their pricing, indeed I happen to think that $600 was pretty decent price. My P990i when it was released was £469+VAT that's GBP, which would be around $900. You can now pick a P990i up for less than half that!
All handset manufacturers have been doing this for years, wise up and enjoy the technology early or don't bother and wait until the price drops.
P.S. P990i battery life and memory seem to improve with the latest firmware.