You can limit free members to schedule particular number of reminders and allow them to upgrade to pro to schedule more reminders. You can sell banner ads at top and bottom of each page.You can sell top sponsor ads at the top of welcome email, reminder emails and admin emails. You can provide your advertisers with real time stats of impressions and hits. This script is easy to install and comes with a Free Installation so if you need any help in installations we will install it for no extra cost.