I think it would be cool to have a book/resource cataloging people's philosophies of life.
I imagine everything from a crack whore's views on the world to a peasant farmer to a middle class salaryman to a spiritual leader. The spectrum of how they view life could be revealing and enlightening. Their world is a reflection of them, and they are a reflection of their world.
And their understanding of their world, their understanding of themselves and those around them could be useful for seeing not only the consequences of a worldview, but also how various philosophies fare under vastly different living conditions.
Useful for wisdom