Is a little bit of disagreeableness a bad thing?

A good answer would include the following key points:
-No; each trait has its pluses and minuses.
-Being low on agreeableness is not necessarily a bad thing; in fact, men and women who are disagreeable earn more money on average.
-Even some U.S. presidents (such as Franklin D. Roosevelt and Theodore Roosevelt) were rated low on the agreeableness trait.
-Disagreeableness can motivate people, especially when it is combined with humor.