Why do only the prosperous preach prosperity?
I think the writers of the bible understood, better than we sometimes do, that there are too many factors involved in someone's poverty or prosperity to simply chalk it up to effort or the lack of it. There are a million moves, strategies, investments, accidents, strokes of luck, strokes of genius, strokes of foolishness, a thousand little injustices, unfairnesses and secrets, scores of prayers and muscles, countless imbalances, that factor into our financial situation. This is why, I suggest, the biblical writers concluded that one's personal economy is up to a higher power, in this case God. Even though prosperity preachers would like us to believe they made it either by grit or gift, the wise know that it's not that simple.