It's obviously possible to spend as much as you want on such things, but I run a forum and a) the software is free (phpBB), and b) the hosting (in the US) is about $15 / month for a virtual server with unlimited storage / bandwidth. If admin is paying much more than $20 - $30/month to keep this system running he's crazy :mrgreen:
I'm sure if you're running a small forum for your local Gaming Clan with 50 users total of whom any 5 are online at any point in time, an overseas VPS with 'unlimited bandwidth' but limited CPU capacity may do the job.
A, highly visible, public forum on a very mainstream topic that regularly has over 100 concurrent users is another kettle of fish entirely

On the subject of the sale of frequentflyer.com.au, I also am surprised at the lack of bids so far. At the current price I'm almost tempted to make an offer myself as their is definitely the scope to make use of the domain as a wider ranging community resource.
ntaus