There are 3 types of uses in Plesk Sitebuilder:
1. Administrator - who can change trial site and notification settings. These settings are configured for trial sites which are created under admin Promotional Link and site owners which are created under admin user.
2. Resellers - who can change trial site and notification settings (these settings are different from admin ones). These settings are configured for trial sites which are created under reseller Promotional link and site owners which are created under reseller.
3. Site owners - these users can not change such settings.
So, resellers have their own trial site and notification settings (each reseller) and administrator has it's own settings which are not interfere with resellers settings.