Well there are many different cost to running a game site like this.

1. Hardware - you can look on BrainKing.info to view what hardware is being used now (which is actually too small of machines to run this game site.... but will give you an idea of what it would cost to get hardware like that and/or better.

2. Connection - you need to have the game site connected to the internet with a quick connection (T1)

3. Software - Software that will be on the game site (OS, database, etc...)

4. Programmer (or programming skills) - you will need to know how to program and/or hire someone who can do it for you... someone to "make" the games and trouble shoot them.

5. Database Admin - either you need to know how to run the database, or hire someone who knows how.

6. Other support staff. For a site like BrainKing, Fencer takes care of most of this - but if this site was to grow even larger, sooner or later he would have to get someone to help answer request, e-mails, etc...

... those are the cost that come to the top of my head - I'm sure there are others, I just can't think of them right now.