When asked about salary, I used to respond (to paraphrase) this way:

I consider the challenge and the fit to be the priority--you can't buy your way out of an unsatisfying job. Assuming the salary is generally commensurate with the demands and responsibilities of the position, I'm going to be okay that front.

It isn't the same as advertising a position at a low salary, but the negative responses have indicated that HR and hiring managers just aren't focused on the "best,...most passionate" candidates.