How to know how many visitors not seeing ads on your website

To know this answer, you should use Statcounter website which tracks every activity of a visitor. This details can be device, demographics, stay time, return visits, recent page load activity, exit links (which include ad clicks too) and so many details.

To get that details, you should have Statcounter free account and later add your website as project in it. Once you create a project with website name and URL, it will give you html code, which should be used in your website to start tracking the details of visits to your website.

If you then, analyses the details, you will see which visitor has clicked and which has not from time and keyword details.