If you're a CEO running a company, you can go out and hire McKinsey and tell the board, "I'm a great CEO, that's why I brought in McKinsey. They're the BEST". McKinsey then proceeds to charge you a bunch of money and leaves you with some very slick powerpoints containing a bunch of advice, roadmaps, org charts, and action items.
If your company has a few good quarters after that you can say, "Look at what a great CEO I am, I brought in some best in class consultants and now our stock price is through the roof!". If on the other hand your company struggles, misses earnings targets, etc., you can say, "It's not my fault we're doing badly, I brought in a team of best in class consultants and even THEY couldn't help us turn things around yet - it must be the macro economy, industry headwinds, etc. Imagine how much worse we'd be doing if I didn't bring McKinsey in!"