One thing that I can tell you is that money can't buy happiness. You're happy only when you are at peace. You can be a millionaire and not having peace and you can be a homeless person and still be at peace.
And my prophet(peace and blessings be upon him) has said : Anything that disturbs the peace of your heart, give it up. :)
Wow Anything that disturbs the peace of your heart, give it up. I always say "If it disturbs your peace, it is too expensive". :)