Honestly...there isn't any harm in letting guests at least see the index, even all other major features are off, like members list, calendar, what's going on, and so forth. If you have your permissions set correctly, they won't be able to do anything, or read anything vital. To completely disallow seeing the board is a big tun off for a lot of people, many of which just may be your best players. Remember, the first rule of building ANY commnunity is to not endorse anything that may limit your audience.
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