You are very value/cost sensitive. Lots of people aren't. I'm a Web Developer. I don't mind spending an extra 20% or whatever for the right laptop.
The 11in Air (which I've owned and loved) has a sub-optimal aspect-ratio for development. The rMB weighs a whole pound less than the 13in and has a significantly smaller form factor.
I can wait an extra 30 seconds for my code to compile. Would I like it to be faster? Definitely. But going from 60 seconds to 90 seconds a few times an hour isn't going to kill me.
For that trade I basically get an 11" MBA with a bigger screen, higher effective resolution, better aspect ratio, and a bit lighter (ports are a non-issue. Other than a Cinema-Display, I never plug anything into my laptops aside from a Projector, and I've always had to carry dongles for that in the past anyways).
What's not to love? Price? This is something I'm going to use most of the day for the next year or so. Compromising over saving a couple hundred dollars would be a mistake (for me).
Plus since I bought the 1st gen 11" MBA, and the original MBA, the 1.2GHz rMB is probably the cheapest laptop I've bought in years anyways by a few bucks.
Ah, finally someone with valid points.
The only question I'd have for you, and myself as I don't know, not sure anyone does yet, when the rMB starts to heat throttle, how fast is it compared to the 11in Air then? I would worry that even though I'm told a 1.1Ghz CPU I'd be stuck at 500MHz as its throttled most of the time I need it. Sure we may not be talking about a long time, maybe 2min to compile instead of 45-60 seconds, but if I am going to drop money on a machine I want to make sure that I am also able to fully utilize it even if I am fine with its drawbacks.
And yes the larger 13.3in Lenovo Yoga 3 with the Core M under a benchmark will throttle down to 0.5GHz. It even has a fan.