As far as corporate accounting goes, the cost of this board is much higher than you would think.
I maintain a corporate intranet as one of my duties. So I’m somewhat familiar with the cost accounting behind something like this. Most hobbyists severely underestimate how much it costs, because they donate so much of the infrastructure, and/or use low-cost alternatives.
Now, I don’t really know how much bandwidth this place requires, or what kind of hardware it requires. And, I don’t know if it’s privately hosted, or hosted with an ISP. Let me make a guesstimate, though:
Internet connection - $5,000 per year.
Server class computer - $5,000 per year (depreciated on 3-yr schedule).
Backup hardware/tapes: $1000/yr
Labor (assuming an employee spends maybe 1/4 of his/her time on the board): $10,000/yr.
Software purchase/upgrades: $500/yr.
Administration overhead: $1000/yr (accounting, payroll for employee, paying bills to ISP, etc)
Now, that number could be off by a huge amount, depending on a number of factors. The board could be hosted in-house using spare capacity on a current server. The bandwidth could be part of an under-utilized T1 line. The employee might donate time after hours. On the other hand, maybe a board this size requires a dedicated T1, two or three servers, and a half-time employee to maintain it.
On the other hand, if you were to cost out the time spent by the volunteers in keeping the place running smoothly, the cost would skyrocket. From the standpoint of the users who want to bitch about the board, all that volunteer time should be considered as a cost.