My UK based cpanel server is currently running to about 42 GB/month, with a few forums hosted on it. These are all small forums though, the largest having only 3,800 members.
The US server that I share with Southernlady has used around 10 GB so far this month, but we only rented the server about 2 weeks ago. That does include uploading the sites to the server.
The main thing that hogs bandwidth is doing remote backups, or running large file / image / media download sites, legal or otherwise.
A large forum (ie. 30,000 members plus) can use a heck of a lot of bandwidth if you offer member blogs and galleries for instance.
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Coop
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