If they take you off for whatever reason, you're doomed.
You are not told how much money you make per click or which advertiser ads your visitors are clicking on.
You can choose which pages you want to run Google's ads on. Adding Ad Sense Search to your site is a good way to increase your ad revenue. Don’t have any illegal stuff on your website like porn, illegal downloads, drugs, etc. Google's search personalization changes the ads based on people's searches, ads for skiing could appear on your cooking website if the person had searched for skis earlier.
For displaying ads with Ad Sense for Content, website owners receive 68% of the amount Google collects from advertisers. Be Careful Don't fall into the temptation of clicking on your Google Ads to make you money.
For example, if your website is about food and the person loves skiing, skiing ads may appear on your food website however the person would be more inclined to click on a food related ad when looking at recipe ideas than what new ski boots to buy.