Happiness is the subjective ultimate end for everyone. Every choice a human being makes is aiming toward their perceived ultimate happiness. Therefore, making good choices would bring you happiness. Aristotle said that happiness was gained by learning to enjoy what is good for you.
Richness has nothing to do with it. Monetary gain is an imperfect good, just read Boethius' "Consolation of the Philosophy." Money only gets you things; money itself is nothing but green bills. Besides, no one is ever happy with the money they have and are always trying to make more.