Ur saying "we know the location of ur isp" like it was a hard thing to know. Google the ISP's name and u will see it. How can u see the distance to my home? Having 1 computer even in the "whole area" doesnt change it, its still related to the ISP. In other case u would have to ask ISP for address.
So basically ur sayin that u will track down his ISP and u will beat his ISP workers? The thing is that u cant locate the specific computer like that. Just the ISP. My ISP headquarters is 57km from my home so im fine here, lol.
Depends. At one point they might close all services to the given IP because of the bad behaviour.
Edit: Or else, accuse the suspect in indetity theft since thats what it is if u scam/hack an account. And to sum it up, every account basicall is your indetity, it indetifies u with a unique name so others can know who u are etc.