In other words, you can DDoS any ip for the cost of registering a domain and publishing a specific DNS record.
replies(4):
The BitTorrent clients I’ve used all seemed pretty polite, backing off for like 60s at least for each tracker they can’t connect to.
If you buy one of the dead tracker domains and point it at an IP of someone else, but their services aren’t even listening on the port client wants to connect to (and don’t speak BitTorrent even if the port happened to coincide), I can’t imagine that even with a million BitTorrent clients wanting to connect it would really be all that much of a problem.