Protected Posts

I was going over my list of feeds this morning, and was caught a bit by surprise when I saw that one of Yuki’s posts on her Kissui.net site was password protected. Nevermind the fact that I didn’t know you can do that on blogs (not that it’s all that surprising), but is this something that’s happening on other sites? I gotta say it’s not really a trend I’d want to see happen — seems like it alienates a part of your readership. I’m sure Yuki has her reasons for doing this, but wouldn’t it be better to create some other protected site instead of mixing stuff like that on your regular blog?