OK...so...now that I have played around with it, the obvious reason for special casing the guest users to 0 access is that you can only have 1 unique user at an IP (even if it is a guest user). So, everyone needs a username.
For emailed surveys, it might work to use tokens in the links for each user so that they wouldn't have to register. But, I guess if you're going to email, then they might as well register at the forum It's just not optimal...and everyone has to be tracked.
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