The greatest benefit would probably be the guarantee of payment.
Explanation:
Many artists take commissions for a variety of styles and reasons! But for the most part, its a very good way to use your skills to make money. I know im still waiting on people to buy commissions from me :D
People that are sad actually sleep less because they just keep waking up in middle of sleep. This disrupts the sleep cycle. Happy people get the most sleep between the two.