As leadership and the body as a whole moves toward the same purpose they develop the same mind. People are no longer doing their own thing. There is a standard.
Better Morale:
This is the kind of church to which people want to belong. They will see purpose and meaning in what is being done. They will get excited to be a part.
More Involvement:
People want to get involved when they know the church is going somewhere. They don't want to invest time and effort into something that is floundering.
Increased Giving:
Someone has said that people tend to give to vision, not need. When there is a feeling of contributing to something that is going somewhere, it becomes like an investment rather than simply paying the bills.
Resultant Growth:
A church operating without purpose flounders and consequently experiences minimal growth. A church with purpose tends to flourish and see measurable results.