(Proverbs 3:10 KJV) So shall thy barns be filled with plenty, and thy presses shall burst out with new wine.
One of the problems that Bible believers have is that if we follow the teachings of scripture and live the way God wants us to live, prosperity follows. It just does. A convert spends less money on booze. A believer becomes less of a glutton. His health improves because he no longer lives in destructive ways. His business becomes more stable because people find they can trust him. These are natural benefits of living a godly life. In addition to that you have all the times that God shields and protects you. Why is that a problem? Because it leads us to trust in our prosperity instead of Jesus.
Are there exceptions? Of course. Nothing in the Bible is knee-jerk reaction. God is not a vending machine that requires the right change and pushing the correct buttons. We are promised persecution. If the Perfect Lamb of God could have the police after Him, why would we expect less?
So? The promise still stands. Our lives are richer in material and immaterial ways. Our hope is assurance, not wishful thinking. Our failures are covered by the adjustments that only God can make. If you consider the Biblical meaning of prosperity then there is a prosperity gospel.