Youre just not the type of user that those devices are made for.. Personally, I always buy the smallest iPhone because I store very little on my phone (like 1-2gb total).
I see no reason I should pay more so that my phone has 28gb free instead of 12gb
If you want more space.. Thate why they sell larger sizes.
Edit: and if there weren't plenty of people like me.. Apple wouldn't be able to sell it and would stop making it.