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Forum Moderators: rogerd
Basically users on my forum can register to own a user name or they can post under any name providing its not registered.
However if its working for you to have them post as any name then go for it. I think it will fall over when / if you site gets more people to it, owning to human nature.
So when I set my forum up I have the section open to the Public to View and Post. In this area I have the TOS, and the Welcomes as well as a few other BAITING items. This way a visiting guest can post an introduction, or make a comment on the things in that section...and get interested in my forum.
In the later sections I have them controlled where only registered members may post... This way I attract the interest of possible forum members by allowing them the free post here or there and get them hooked and when they want to post in the Real Disscussion areas they need to make a choice about registering and become serious.
As the forum achieves some level of popularity, though, you'll have to deal with problem posters, more spam, nickname impostors, etc. - when it hits this point, you'll have to go to registration for more tools to prevent problems.
On the plus side, by that time you'll have enough people who are forum regulars that registration won't be a big turn-off.
Once popularity builds up switch to a registration only forum.
I even have one that I've had to turn new registrations off for the amount of abuse, trolls and spammers on there, its registration by email to admin only!
Guest posting is allowed on my forum, but the majority of posters (it's just starting out) register first. I think most people have got so used to registering to post that it probably won't make much difference whether or not you allow guest posting.