I sent YouTube an email, and got the following:
We realize that there has been a recent rise in spamming issues here on YouTube, but thanks to you and many other users, we have been able to ban 100s of users who have been spamming such as lolitabrasil, xacana, moodswing, sirirca, kanefevehure47 and many others. We are working on creating a spam free site and hope to have ways of implementing this soon. We know it annoying!!! Keep reporting these users and we will do our best to rid you guys of spam!
Thanks for reporting this!
Yes! It annoying!