I'm hiring a personal iOS prototyper

Wow, gotta love the 37 signals guys and Jason Fried. This is a killer job posting.

Salary, location are clear.

Job skills required are clear.

Boss/employee relationship is clear.

Vision/motivation is clear.

Ok, well it might not be perfect but it's a lot better than a stale typical job posting.

Anyone who is as talented as they need can already earn more than $100k, especially in a major metro area in the US.

sounds to me like he is open to that possibility...

He seems to be looking for the mythical developer/designer hybrid. Is $100,000 a decent salary for someone with that skill set?

In Chicago? I doubt it for anyone else, but someone might do it for this opportunity. I'd hope that this is just in line with what 37 signals pays -- they have other benefits.