To emphasize pmcgrathm's point, the $60/hr "level" is for "Management/C-level" candidate interviews. If you're paying a consultant to ask "the right questions," then at that level you're paying another management/C-level person, or a very experienced "C-level" headhunter/recruiter, and they're unlikely to do it for $60/hr.

That said, the same is true across all these pricing tiers. I wouldn't consult on a Junior level interview for $60/hr, much less $30. I can earn twice that as a W-2 contractor doing boring, unchallenging enterprise architecture and software.