What makes you think he is talking about money...couldn't you be "rich" in other ways? just a question...
Most of the scriptures that speak of God's blessings refer to "prosperity", whether it be land, herds, money or children. You have to have money to function in this world....and God knows that. Why would He bless you with children...and then not give you enough money to care for them properly? Why would He bless you with land...and not give you the money to pay for its upkeep? (It's expensive, believe me) *chuckle*
If your only intent is to prosper yourself and not build His Kingdom through tithes and offerings.... then your heart is not right, true?