From my experience, most sites now have a two step registration process to insure valid sign-ups, just as we do. If the 2nd step isn't completed (confirming receipt of email), then the process remains in limbo. Not sure I'd call that a "problem" or not. We certainly aim to keep things easy and simple but there's clearly a need for some level of security to combat spammers, hackers, etc.
Perhaps we need to send reminders when the 2nd step isn't completed. We'll look into whether that can be automated.
Thanks.