Amusingly, a subreddit I frequent has one notorious user who has abused the 'block' feature to ensure their frequent posts on a particular topic are free of dissenting commenters. They block anyone who even slightly disagrees with their position, this prevents them from seeing his threads, and the comments on each thread become entirely one-sided as a result - and the growing list of blocked people have no idea that those threads even exist.
Edit: From your comment history you sound like an Aussie, so I reckon you are.
Dude's been suspended from reddit now - as in by the admins. The moderation on /r/AusFinance itself is simultaneously extreme and very hands-off. It's basically AutoModerator set to kill (no naughty words, minimum karma requirements, minimum comment length, auto-deletes posts that have a few reports, likely with no human confirmation). Has a lot of false positives and yet allows very disruptive behaviour to carry on just fine. Not ideal but presumably the way it is because it's a growing sub and the moderators are unpaid volunteers that lack time.
I'm pretty happy with it now that you-know-who isn't around. But he'll be back as soon as reddit's presumably IP-based suspension-evasion-detection's time limit runs out.