I'm not asking you to work for free. I'm asking you to provide code samples. There's a big difference. It's no different than coming into my office and coding on a whiteboard for me.

And for your other argument, I have a full time job but will sometimes take very short term (5-10 hours of work) contracts for interview purposes. Usually this is a last step before getting a job offer, more as a way to gauge whether I'd work well with the team than whether I can code in general.