Sometimes you want to scream at the phone when you can't do something as simple as close an account.
Handling the mess that is Multisite registration and emails when you're on a per-site basis.
When you lose your domain, you may not lose anything.
It's a holy-grail to many. Make a per-site registration form that will not only let users sign up, but actually add them to the site they signed up from!
Domain registration is a different beast than it was a decade ago. What used to be faxes and phone calls is now all email.