Paying the labor to maintain the site. (Roboop) (Yes Admins/mods are volunteer.)
The gears hardware/software to allow 100s of chatters to text/voice/video chat all at once.
The server bill.
The webspace.
The domain name.
A person like Robo who invests his life into this should get paid for his work, and it costs money for the already mentioned gears/hardware/software/server etc.
$3,000 x 12 = $36,000
And that number is just a goal.
$36,000 a year for the amount of labour done by roboop on this site is a severe underpayment in my opinion. And again, that's a goal, not a for certain reality of the amount given.
DISCLAIMER..THIS POST ISN'T COMPREHENSIVE AS TO HOW ALL MONEY IS USED..IT'S JUST A GENERAL IDEA.