[jerx]

Originally Posted by Spinball

Don't want to give away any trade secrets here, but that is commercial suicide.
One major way to make money from your forum is banners. Block visitors and you will be blocking roughly two thirds of your potential banner impressions (based on our stats of one third members two thirds guests on average).
And block visitors and you are blocking spiders so the threads in that forum won't get into Google.
Bad, bad idea blocking guests.

I don' t think that this is commercial suicide for most sites. I expect this mod to be used by sites with little adult content.

Our site for example does not have any adult forum yet and we are still wondering whether it will have one in the future. I cannot imagine that blocking guests from such a section would have much impact on us. We would need to focus on adult content to make this happen and that is not what we intend to do.