3 Reasons
1) Lets say you have an established forum with a bunch of members and you want to start a new forum wouldn't it be nice to tell everyone they can visit and are already registered members?
2) Say you have related forums, say a music forum, one for 80's music and another for 90's music- you can now give each a separate identity but share users and some forums between both sites.
3) From an admin standpoint it's only 1 install to maintain and backup to cover all your sites.
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