Success! People are loving your top product so you increase your budget to get even more sales, and it worked - you've sold the entire stock! Unfortunately, half the days budget was then spent on an out-of-stock product.
Ads Defender would have alerted you as soon as the product was out of stock and paused the related ads immediately.
Fraudulent clicks may eat up even 20% of your sponsored links budget.
The Click Fraud option of Ads Defender successfully protects you from such unfair doings as it filters out invalid addresses and blocks fraudulent clicks.