In the MyStreamSpot Portal, you can now view the amount of viewers that have subscribed to your account.
To see the Subscriber count click on Live View Statistics.
From this page, you will see a count of how many viewers have subscribed to receive notifications of your weekly broadcast schedule. For more info click Subscriber Manager.
Now you can see a list of all your subscribers and remove them if necessary. This page also has a search filter that can be used to narrow down details.