Who's ever name is in the ISP's contract will be sued. It's very simple, stolen software is like anything else in real life that is stolen, its against the law and valve are within there rights to take you to court, and if you are logged playing the cracked version it's very hard to argue otherwise.Darth Valium said:"in dubio pro reo", the one who sues has to prove, not the one who is sued. comparing to cp is imho quite stupid.
"friend" is perhaps bad, say " a family member" instead, so you can't be forced to give out the name. and the pc is a family-computer with no access-regulation(aka averyone uses admin-account).
assuming those people will get sued after each other is totally dumb.
"yeah someone snuck into my house and download CS:S and played it for two days"
You seem to think Valve isn't in the right to sue people who have stolen there game? Of course they won't sue everyone, but if they do sue there sue a fair amount of people to put there point across. I can only see them sueing people in the US, much easier (and legal)
If i owned valve, i would not sue people but there well within there rights. You downloaded an illegal piece of software, end-off.