I was studying in Sefer Ha-Aggadah with a chevruta this morning and we came across a passage about prophets having to have certain qualities, including wealth. I followed the reference to Nedarim 38a, which quotes R. Yochanan as saying: "The Holy One, blessed be He, causes His Divine Presence to rest only upon him who is strong, wealthy, wise and meek." He then goes on to say that all the prophets were wealthy and brings proof for four of them: Moshe had the shattered sapphire tablets; Shmuel had a house in Ramah and when he traveled all his household and belongings traveled with him; Amos was the owner of flocks and sycamore trees; and Yonah not only bought passage on the ship but hired the whole ship for 4000 gold dinari.
This passage seems to be talking about material wealth in this world. Why would the holy job of a prophet be tied to material wealth, and is the wealth a prerequisite or a consequence of prophecy?