"Wealth obtained by fraud dwindles, But the one who gathers by labor increase it."
Vain=emptiness, vanity, evil, ruin, uselessness, deception, worthless, without result, fraud, deceit, lie, falsehool.
Anything gotten by dishonesty, by manipulation, by means other than God's way will not satisfy, will very possibly be taken away; will bring heartache rather than joy.
If you're tempted to get rich or get the object of your lust or get famous in quick ways, in ways condoned by the world, DON'T DO IT! It is a sure way to get heartache and pain and loss in your life. Don't believe the Las Vegas commercials. You can't keep sin in one place. It isn't easily contained.