How much ad revenue a website can generate depends on the type of content and what topics the website is about and how much website traffic that website gets.
The higher paying the topic and the more website traffic your website gets the more ad revenue can be made.
Some websites earn $1.00 per day while other big websites can earn $1,000.00 per day or more from ad revenue.
The more website traffic you have the more money you'll make. But the more traffic you have to your website the higher your hosting costs will be.