3. Cost.
Yes, it costs money to run it, and yes I pay the bills.
Servers are mine, and I pay to maintain them, as well as keeping the license for the Forum up to date annually. (about $100)
Electricity is also a surprising hidden cost, I've learned lately. (keep your PC with a 500w power supply on 24/7 with something running actively using the processor for a month, and check your hydro bill!)