The RMT advertisers have gotten increasingly obnoxious lately, what with the fact that they now send Friend Requests alongside spamming you with Tells, but I really don't think it's an issue so severe that it warrants unsubscribing. Learn to ignore that stuff, or set yourself on Busy so you won't get pestered.

That being said, I think the institution of a larger blacklist would be helpful along with a function where it automatically removes characters who have been deleted from the server. Saves me the trouble of having to occasionally comb through the list just to manually remove deleted characters whenever my list's hitting its limit.