The idea behind this plugin was to create a really useful tool for people that have a real interest in their audience and one of the most important feature of this plugin is the ability to filter though the visitors and only be displayed to the targeted audience. For example you can select to display the popUp only to unregistered users, or only to first time visitors. You can imagine that making such decisions requires some kind of information about the visit and the visitor to be stored, so you even have this information available in the admin section.