I don't live in the US, so my ISP doesn't really seem to care what I torrent, but the megathread vehemently recommends to always use one. Since VPNs aren't cheap and I'm on a strict budget (wouldn't pirate otherwise), is it really that dangerous to torrent without one?
What I've learned overtime is high profile things like movie releases will see a nice email from your ISP. Anime relating thing that are under the radar won't have much trouble. A little risky, but that what I've learned on that side.