There is an option under System > Configure that states we can / do get alerted when we are reaching our VSA Limit. We have consistently and repeatedly hit this limit and have never seen an email. How does this work?
This alert does not send you an email - it just displays a message in the notification bar when you log in.
When this message appears, there is a "snooze" option. If, at some point in the past, you selected "Snooze forever", then you will never see the message again.
To correct this, go to the system tab -> preferences and click the "Clear Snooze" button at the bottom of the page.