We have all are own servers, The question is how and where do you connect them into the internet.
You can either colo them with some service provider, basicly put the servers in there building. Or run a line from there building to you. Putting the servers on there sight is less expensive, and provides acces to hi bandwidth burst. But either way you are at the mercy of your providers connections. We have moved the Main arena , same server you have been playing on, to another building, hence another provider with different routs into the internet.
HiTech