But also because that's the only way evil in the story can actually exist, and thus actually reflect the suffering and conflict in real life. The Triple-O God can't exist, as evidenced by gestures at everything
Even if the Christian God was real, Omnibenevolence is the first characteristic to be dropped, as the Bible already depicts a cruel, wrathful, egotistical and petty God.
Technically you're using it to buy a house, so I guess that qualifies as spending it?