Actually you don't need a large forum to make a lot of money.
STACKTHATMONEY Private Forums
That forum only has 50 members and makes $10,000 a month by charging $200 / month for a subscription, not quite fastlane but 100 or 200 members would definitely be getting there.
Here is another example of a forum taking the paid membership route -
PPV Playbook - Winning Tactics for PPV, PPC, Media Buys and Social Marketing
You don't have to build a massive 10,000 or 100,000 member forum to be successful you just need to create a quality community and build a lot of perceived value.
If you want a better explanation of exactly what perceived value is about check out this thread I created -
Are You a Honda Civic or an Aston Martin? with a post that was originally from my blog.
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