If you are using ACTION_BY_CUSTOMER, you will never see any counts in your new subscriber email notification. You will only see contacts who are added with the value ACTION_BY_CONTACT. This does not include anyone added by the Bulk Activity API as well as those are all put in as ACTION_BY_CUSTOMER due to the nature of bulk activities (meaning contacts would never request to have 25 or more addresses added or updated at once.
Dave Berard
Senior Product Manager, Constant Contact
