It is free money.
Let's say you think buying ABT at $46 is a great deal - in other words, wether the stock drops or not, you are committed to the idea of owning ABT at $46. So you buy 500 shares. $23000. Over 5 months, the stock drops to $44. You have a loss (assuming you sell) of $1000.
Now, say you decided to sell puts on 5 contracts at $2. You can either use ABT stock you purchase at $46, or your MCD dividend paying stock as your collateral. Anyway, that will give you $1000. If the stock does nothing, or rises, or only sinks 1.99 or less, you make $1000 regardless because the puts expire worthless. That is free money. It is time value money that people give you that shrinks to nothing with time. If the stock tanks, you were commited to owning the stock at the higher price anyway, so you haven't loss anything you otherwise weren't committed to.
If that isn't free money....