Yeah, like I need my registrar calling me all the time. What if you have several hundred domains? Are you really going to call and harass me about each one?
Sure, but you always have a few Truly Important domains, that you DO NOT want to lose. This is about those. An easy solution would be to charge you a few bucks more for domains you designate as Important.
No more than they would send you several hundred separate bills. If all the domains are linked to the same account, verify the account and you're done.