I noticed something about the option of subscribing to a forum when I was editing my profile. What does it mean exactly?
vBulletin support says: “Currently, subscribing to a forum does not include email notification. All it really does is put a list of those forums in the user’s cp.” (insert appropriate smiley here)
Yeah, that’s what I figure…okay, thanks very much, guys. 
You’re welcome. Now go post something intelligent in Comments on Cecil’s Columns!