Not all individuals grow up in supportive and loving households, and a person's self-esteem or self-perception can be greatly affected by the lack of these. When a person is empowered, they are not only seeing a different side of themselves, they are inspired to discover how they fit in within the dynamic around them. Empowerment is much like positive energy and optimism; the ripple effects can be felt down the line.
Business as usual sometimes forgets the complexity and depth of the individual, and without acknowledgment, understanding, and empowerment, people are not as likely to fully invest their time or energy in the projects upon which they work. This, in turn, detracts from both the potential of the business and the potential of the individual.
A motivated person is more open and tuned-in to their personal and professional situation and therefore more likely to care about the advancement of the business (or even themselves in the business). When one feels valued, their natural inclination is to be more invested in the project or task that provides this feeling.