Apple has teams of people calculating the best price points for Apple to make the most profit. It might be preferable for us the consumer but, Apple has decided that the 16GB option makes them the most money. As a business, they are making the correct choice.
You do know that Apple is the richest company in the world, that the mark-up on the iPhone is huge, and that the iPhone is their best selling product? Why does their profit margin excite you so? Why do you wish them to gain more at your own expense?