SCADAR's unlimited sync quota is intended for 'EXTREME' users or 'SHARED USER ACCOUNTS' that are used by more than one person
'EXTREME' or 'SHARED USER ACCOUNTS' are likely to exceed the fair use sync quota of 10 audits in each calendar month.
Such users / user accounts are recommended to select the 'UNLIMITED SYNC QUOTA' option during the subscription process!
As the feature suggests, this selection increases the SYNC QUOTA resources available to that user account.