Gangrene is caused by poor circulation. If there is enough sugar in the blood, bacteria can reproduce, producing an infection that can cause death.
A society with too much wealth can also have stagnation, where some people have nothing to do, and people who do have work do meaningless things.
It's possible to have blood that circulates just fine in a body that still has some serious circulation problems. It's possible to be a very busy person and have parts of your life that are stagnant.
A person can lack money, friends, or the ability to be content with the wealth that they do have -- poverty -- and yet can still have wealth in them. They can be sure that they are right -- believing that things can't be better. And they can feel like on some level, they are done, have figured things out, and can be rich enough to not turn to God -- despite the poverties they do feel.