They do it because they want to help others. But there is an expectation that the clergy will earn enough to provide for their families. The business mentality just doesn't understand that some people do things out of the goodness of their hearts. The poor, middle class, and wealthy think differently because of their backgrounds as well. When it comes to food, a mother of a poor family will ask her children if they had enough to eat.
Wealthy people are concerned with how the food was presented.
Poor people are motivated by survival, family relationships and entertainment. The middle class is motivated by work and achievement. The wealthy are driven by maintaining financial, political, and social connections. Putting that into perspective, you can begin to understand what happens in the Legislature and why. The middle class will typically support these.