You're not really paying for the RAM, you're paying for the RAM plus installation. It's cheaper to produce 2, 4 models on an assembly line and if you wan't to have 4x RAM just charge you a lot.
I just buy the model with the less RAM and upgrade myself, in some models it's covered in the instructions and are not too hard to upgrade.
I just buy the model with the less RAM and upgrade myself, in some models it's covered in the instructions and are not too hard to upgrade.