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?
I find that most VPNs are so heavily shilled that by that very nature, makes them suspect. Since the days of Napster, WinMX, Bearshare and the like, I've gotten exactly 2 "Hey, knock it off" letters from my ISP. And they were both from new-release, mouse-affiliated movie releases from a public tracker.
Get in with some of the private trackers and 99.9% of the worry disappears. Try not to upload terabytes of data, and the majority of ISPs (I mean, two of the 3 that seem to have the monopolies at least) wont even bother sending the notices.