There actually is a way to optout as a webmaster, it needs to be setup by older clients in the template though.
This is an option which is available on new edit templates.
If it is a newer & fresh install of NATS then this article will show you where to find the option as a reseller:
http://kb.getnats.com/idx/0/150/
If any NATS owner wants this option on their edit page, they can ask us to help them add it.