Fair. A better comparison would be System 76. Comparing the 15" to System 76, I get a bigger screen (16"), TWO 2TB M.2 drives, and 64 GB RAM for $150 cheaper than a 15" with one 1TB drive and 32GB RAM. And the System 76 comes with a bunch of ports, too. For the same specs, it is $550 cheaper.
What comparison are you trying to make? You are not painting a full picture, leaving the weight, CPU and battery life out of the equation. If you personally care about neither, yes the Air will not be the machine for you.
I've yet to find a non-apple laptop that's as ergonomically comfortable _as a laptop_ as the recent Airs. That's a premium unto itself, I don't know if it's $500 worth, but that's a less tangible part of the equation over raw horsepower.
I don't even necessarily object to paying a premium. If it was $200 to go to 1TB or 32GB RAM I'd probably be annoyed but still pay it. There is a difference between paying a premium and wholly unjustifiable prices.
