3 Nephi 24

Dallin H. Oaks said: "Some people say, 'I can’t afford to pay tithing.' Those who place their faith in the Lord’s promises say, 'I can’t afford not to pay tithing'" ("Tithing").

Tithing blesses your lives. Malachi has said:

"Bring ye all the tithes into the storehouse, that there may be meat in my house; and prove me now herewith, saith the Lord of Hosts, if I will not open you the windows of heaven, and pour you out a blessing that there shall not be room enough to receive it."

If we pay tithing, the windows of heaven will be opened unto us. Blessing will be poured on us, so much that we won't have room to receive it. These blessings are both temporal and spiritual. Who doesn't want that?