2 Answers

From wikipedia.

In religion, a prophet, from the Greek word προφ?της (profétés) meaning "advocate", is an individual who is claimed to have been contacted by the supernatural or the divine, and to speak for them, serving as an intermediary with humanity, delivering this newfound knowledge from the supernatural entity to other people. The message that the prophet conveys is called a prophecy.
Claims of prophets have existed in many cultures through history, including Judaism, Christianity, Islam, the Sybilline and the Pythia, known as the Oracle of Delphi, in Ancient Greece, Zoroaster, the Völuspá in Old Norse and many others. Traditionally, prophets are regarded as having a role in society that promotes change due to their messages and actions.
In the late 20th century the appellation of "prophet" has been used to refer to individuals particularly successful at analysis in the field of economics, such as in the derogatory "prophet of greed". Alternatively, social commentators who suggest escalating crisis are often called "prophets of doom.

I guess prophets profit from all their followers.