Aren't you more worried about people seeing it through the torrent client? It's the full IP and whatnot. But yeah, the L33T HAX0Rs have better things to do than going after the small fries.
Here's a program I find useful. Peer Guardian is an open source IP blocker that blocks known bad IPs(not individual people, but sites loading trojans and industrial associations such as MPAA that monitor bt traffic for lawsuits... etc.)
http://phoenixlabs.org/pg2/