In lots of "lamer" or "newb" channels, they op everyone that comes in, trusted or not, and they most likely have some fullscript which most likely has a "I'll kickban you if you ban me" addon loaded. Removing one of these users can cause a little headache, because once you try and ban them, they immediately ban you, causing you to have to invite yourself back in, unban yourself, deop the user, ban him, and just hope no one has a "I'll kickban you if you join the channel while banned" addon loaded. I'm not saying that this will be like the addition of the if-statement or /filter -k, it will just be a way of using less code.