Tithing is not a matter of money, really; it is a matter of faith—faith in the Lord. He promises blessings if we obey His commandments.
I have come to understand that the Lord's richest blessings are spiritual, and they often have to do with family, friends, and the gospel. He often seems to give the blessing of a special sensitivity to the influence and guidance of the Holy Spirit, especially in marriage and family matters like raising children. Such spiritual sensitivity can help us enjoy the blessings of harmony and peace in the home.
As we pay our tithing faithfully, the Lord will open the windows of heaven and pour out upon us His richest blessings.