Sin is expensive. Incredibly expensive. But the price isn't paid in cash, it's paid in mental, emotional, and spiritual pain. God didn't create an arbitrary list of "DO's" and "DON'Ts" to see if the world would follow them. No, He laid out a set of essential guidelines for living. His anger towards lying, stealing, cheating, coveting, murder, jealousy, and pride is because all of these behaviors destroy relationships. Everything that the Bible is trying to protect us from. His desire is love, peace, grace, and harmony with him and with all creation. Sin is our defiant rejection of this in an effort to satisfy our own selfish desires.
Romans 6:23* For the wage of sin is death, but the gift of God is eternal life in Christ Jesus our Lord. (NIV)