It only makes sense to have a system in place so you don’t lose track of the domains you own, your logins or email addresses for notification.
We usually keep track of this for our clients and make sure we are info’d on emails. so that this kind of thing doesn’t happen:

Someone, probably someone not named Phillips, neglected to renew the domain name “dallascowboys.com” and as the Cowboys were playing the Packers on Sunday night in Green Bay, the site was replaced by a page that indicated the name was available for purchase from Network Solutions.

If it can happen to the Cowboys, it can happen to anyone.