Sales people rarely make good consultants but consultants can learn to be great at consultative selling. It does not mean getting a personality transplant and ditching their integrity and principles. In fact it is those very things that give them the edge at winning business in the world of technical services.
If you are an ambitious consultant who wants to be a successful principal consultant or start your own consulting business then you will need to develop your selling skills. Fortunately, with consultative selling, its probably easier than you think.