DeletedUser
Guest
Your IP is fairly location specific so it could uniquely identify you from say someone hundreds, if not thousands, of miles away...
Yes, the usual co-player relationship seems to be 2 people on opposite sides of the world, but I do know people who co and even live in the same part of the world, or even the same state.
Besides, I enjoy having a co to bounce ideas off of, and enjoy the game more with one. I play a world solo too, and it really isn't the same or as much fun. I think finding a co that you click with is a huge thing... it can be way more than someone to cover the hours you are asleep or gone.