Yeah, I periodically need to take people I've added off of it as well.  Usually I put people on ignore when I'm visiting Bitcoin Discussion, because that section is a repository of carbon-copy, cookie-cutter crap.  People's posts all say the same thing within a given thread, and I tell myself that there's never going to be anything worth reading from them--and then they'll post in Meta and they're not as illiterate as I thought.

People are just so motivated to crank out the posts because of bounties and campaigns that they'll drop a whole bunch of shitposts that are easy to write and have zero substance.

The problem is that there are so many new accounts being created, making shitposts, and you can't add them to your ignore list fast enough.