Reading how expensive they are I'm glad McKinsey isn't used anymore.
The major reason they're hired is because of the McKinsey name (convincing others in your company). Not so much for anything else IMO. Maybe you we're doing great work but that's not the ones we saw (I saw various).
So, essentially it requires the same skillset as a fortune teller.
(In the private sector)
Does it mean advice as good as the advice we're giving other firms like you?
This kind of advice is hard to get for the C-suite outside their boardrooms (which may be biased).
Or, in other words, if a manager makes a wrong decision then it costs the company $x00,000. If an SVP or C-level screws up, it costs the company $x0,000,000+.