I can give some insight into this.
At my work I’m looking to co-locate some of our servers. A full rack worth of space (it’s a 6 foot rack), in a secure location, with back up power, a single T-1 line for bandwidth and a block of 16 IP addresses will run me about $1200 a month. If I wanted redundant bandwidth it would be about $1700 a month. This is a grade A, tier 1 type space.
Those are “friend” prices because we have so many 800 numbers and T-1’s through this telco provider. Even still, minimum would be $14k a year with a 2 year contract.
With another project we have a rented dedicated server with a T-1’s worth of bandwidth for about $500 a month - $6000 a year. This is fairly cost effective because it covers power, hardware and networking costs.
Bringing a T-1 with bandwidth into our location is about $600 a month for a single line - $7200 a year. This is just a raw line. No power backup, data backup, network security, administration, etc.
The company I work for bills me out at $120 an hour for sysadmin work. When I freelance I bill myself out at $50-60 an hour depending on the job.
With that in mind let’s add some conservative numbers.
Consider a rented, dedicated server. That’s $6000 a year for hosting.
You hire an admin for $70 an hour and he/she bills one hour a week for a year - $3640
This totals $9640 a year.
I think the bulk of subscriptions at SDMB are “charter members” at $7.48 a year. At that price you’d need almost 1300 subscribers a year to cover basic bandwidth and admin costs. At $14.95 you’d need about 650.
This doesn’t factor in other costs like bank fees for credit card payments, accountant fees, taxes, hardware costs, or any form of office space.
The main page of the forum says there are 54,922 “members”. I’m almost 100% sure those aren’t active, paying members. That number would include banned members, guest accounts, expired subscribed accounts and I’d guess the accounts that were in the database before SDMB went to a subscription format - and those members never subscribed. Just guessing, I’d say SDMB has around 1000-2000 active members.
Using those numbers, and figuring I did my figuring right, SDMB might be breaking even.