Because the rest of my site doesn’t need anybody logging into it. Really, the forums are a completely separate entity from my blog (different topic entirely, very tangential). So it would make perfect sense to make it a separate WP install. I suppose it would just be convenient to manage the plugin administration together with my blog. I’m not sure if that makes a lot of sense to anybody but me. 🙂
I’ll probably just end up installing a new copy of WP. After all, I had bbPress as a separate install in the first place. I was just wondering if I could manage bbPress users separately from the WP site it’s installed under.