It doesnt cost that much but ever penny counts when they design phones. A few cents builds up. Remember alot of the final cost includes money to pay for development, marketing, packaging, construction, tax. Also things like RAM and Flash don't have static prices, they fluctuate alot with demand and supply. That makes it extremely dificult, especially when you consider the price of the phone will drop by upto 30% in the first year.
The other thing is after a certain amount of ram you need more address lines to be able to reference it all. This adds routing complexity when you're routing out the PCB.
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