Did you know that auto insurance companies allow you to look up a quote online.  All you need is your name, address and date of birth and they will show you your cars!  That means you can with a little effort find out what cars people have!  Year and Model at least.  That could be valuable info for sales or targeted advertisements.  The crazy thing is that the website does not require you to agree that you are who you filled in the box says you are!  So, technically I don’t think you would be doing anything illegal.  Crazy.