I'm a YouTube commoner and occasional video uploader. I was also once a dedicated YouTube spam fighter. But that was before YouTube's staff decided that it was easier to remove their own eyes and ears rather than address the problem and allow the vigilant userbase to serve as their eyes and ears wherever the staff themselves could not see or hear. Fortunately, the registration process seems to have improved its efforts to weed out spambot accounts. Unfortunately, the spam fighters among the userbase no longer have any means to report spammers aside from a questionably effective "Flag as spam" option for each comment...and no effective way to report a spam account from its profile page. They even removed the secret "Report User" links and pages as well.
Good luck with the spammers, YouTube. So many of us would love to help you fight to keep YouTube spam-free, but you went and neutered your own allies. So if that's how YouTube wants it, then that's how they get it.