> "but it wastes a lot of the interviewer's time (and potentially money)."

I think there's something to this ('corporations are people too my friend!' one might say :) ). But I feel differently when speaking to recruiters, if I'm looking. Ultimately they're paid to get interviews. I assume their metrics are like any sales team's: get interviews, convert at least some of them to paid positions. I can't see how I'm wasting a recruiter's time if there's any chance at all that I'd take the job.