Ok, here is your reason, actually a choice. We choose life or death, sickness or health, poverty or prosperity. The Bible can help us to know how to choose life, health and prosperity. (no I do not mean money prosperity) For example my son bought at tee shirt that says money is the root of evil. Actually the Bible says the Love of Money is the Root of Evil. So the lesson is do not love money. It is the love of money that cause misery. Not the money itself.
1 Timothy 6:10(NKJV) For the love of money is a root of all kinds of evil, for which some have strayed from the faith in their greediness, and pierced themselves through with many sorrows.
So there you go, the Bible shows you a way to avoid many sorrows. It's your choice.