Trial Period
				
				
                
                    
                    
                
                
                    
						
                
                
                    Very important question, ya'll...want to offer a 14 day trial period and graduate the advertiser to paid afterwards. I'd think this would be answered here but don't see it. Pls help.
It isn't clear how to prevent abuse? Cookies? What if user switches computers? 
Definitely need to figure this out...
thx