I would grant that they know within three orders of magnitude. If they think you're bringing $10m in value, you're probably bringing at least $100k. I'm not sure I'd concede anything more specific than that, though. A lot of enterprise consulting is the blind hiring the blind, or people hiring partisans for some kind of internecine battle. I haven't even sought it out, but I've seen, at pretty close proximity, millions of consulting dollars go directly down the drain.