It's up to you, but If you allow anonymous users to post on your forums then you will probably likely have to delete more than half of the anonymous posts if not nearly all of them.
It can sometimes be hard to get member signups, but if someone really wanted to come to your forum then signing up only takes a few minutes.
Anonymous posting will just open the gateway for alot more spam. I have seen it in some of the forums that allow anonymous posting.
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