Re: One year at a time?
Have used CSC for managing a five figure number of domains. A little expensive for small numbers of domains but it's a fully featured service for managing domains with different company accounts and administrative permissions across the portfolio.
To manage to not see the reminders in a well setup CSC account you'd need to get rid of a lot of people, have a crap email platform and a lot of idiots. IBM have done well to only lose three domains....