They don't sue anymore, they just send you letters. You are welcome to send it back or flip them off, whatever, the ISP will just typically ban you from their services for life after the 3rd time. Still not a big deal, you can just start service in someone else's name, but it's not as simple as ignoring them.
BTW -- Canada sucks for torrenting. The Canadians I know from private trackers have their torrenting throttled during peak hours and/or have bandwidth caps. Wow!
Anyway, they stopped the suing a long time ago, most ISPs here don't throttle (FCC said they'll get angry if USA ISPs throttle), and most don't have bandwidth caps. Enjoy your throttling and pitiful bandwidth caps while I download well over a terabyte at 20mbps or more.