Jesus Taught - No Paid Preachers

When Jesus sent the Apostles out to teach the world about the Gospel he told them that they had freely received and they were to freely give. They were not to be taking money for the service they gave. The Prophets and Apostles had jobs and supported themselves through their own labor. Why can't modern day pastors do the same? Is being a preacher another form of entertainment or a profession like being a lawyer or accountant. Should preachers ever get rich?