Yes, most definitely. I have significant experience in web development, functional programming and iOS development. iOS development is by far the easiest way to make money (see also the low hanging fruit comment by somebody).
There's plenty of reasons I choose iOS, that this poster shares.
Knowing exactly what screen sizes you're developing for is huge, and there being only 1 or two can really help you make a polished UI. (For example, compare the Facebook app on android and on iPhone.) Also the culture of quality is something I enjoy.
Reducing this post to your one-liner makes some assumptions. Money will always be a big factor, yes, and if that's what you meant, then great, but those other reasons are also big reasons for developing on iOS.
