True enough, but as a general rule, I never buy extra RAM from Apple if I can avoid it. The stuff that is baseline installed seems to have a reasonable price tag attached, but they really do price gouge when it comes to adding extra RAM as a BTO option. So that, plus the fact that I doubt that RAM is user-extensible in the new MacBook Air (they call it 'onboard RAM' on the Apple Store, which doesn't fill me with confidence.)
I do exactly the opposite: I never want to have to open up a piece of hardware (I've done that plenty in previous lives)--I want to treat my computers as appliances.
So if I want 4GB of RAM, Apple it is.
Isn't the fact the RAM isn't user-installable (true) in the MBA even more reason to buy the full boat?