I have no buisseness model at all.
We are not a busssiness, just a small non profit association with interest in photography.
No budget for hiring anybody.
We dedicated a lot of hours to maintain the forum for free.
I have thought that there was a daily summary option, but may be it is ghost blog or other system.
I will just disable email notifications by default and see if we can fix email problems with the host provider.
They do say nothing about message limits and we are not such a big forum, we do not generate thousands of emails a day.