Depending on the day, we can sometimes get 10+ people registering for the blog. Unfortunately most of them are spambots. I go and delete the spam accounts every two days or so, which is why the total number of users keeps changing around but not necessarily increasing.
Also, the reason why all the members aren't shown on the userlist is because that account has to \"do something\" to have it activated in the forum. This means either they post, or somebody clicks on their profile when they're the \"newest user\" giving them a profile view. Basically, if your stats are all zeros in everything that gets tracked on the userlist, your account won't show up there. At least that's my guess as to what's going on.
Did that answer everything?