Earlier quoted context omitted.
Those are some high standards, you value your time at 250×8×5×52= half a million a year? I don't disagree that 30 hours is way over the top for an interview question unless you happen to find it as much fun as , or if it's somehow usefully spent time for other reasons, but your response seems to be at an equally extreme end of the spectrum.
This isn't a guaranteed full time job. For all intents and purposes, it's a short term contract with very little notice. Dev time is like anything else, if you buy in bulk (say... 2000 hours a year) and on a regular schedule, you can get some pretty good discounts. I'm in the mid-west, and that's a little under my rate for short-term low-notice (read: emergency) contract work. I can't imagine anyone on either of the…
So for clarity, they will jump to do 10 hours for 5-7 technical interviews at $0 but won't do 10 hours of paid contracting work where they get $2,000?
I can't speak for anyone other than myself but $200 / hour is pretty damn competitive for any contract work no matter where you live. That's $192,000 a year if you put in 20 hours a week (half the normal 40 hours that most folks put in). I wouldn't classify this as emergency work either. You're getting notified of a contracting opportunity in the form of an interview.
I spent ~20 years doing contract work. If someone messaged me on Wednesday, unless I'm really busy chances are I could start working with them the upcoming Monday. Sometimes I do find myself booked for weeks or months but if someone comes to me for an oddball job where I know it's only 5-15 hours of work and they're cool with me only putting in 1-2 hours a day then I can almost always find time to do it, even when I'm at near max "comfortable" capacity (~40 hours of contracting work a week).