Sure, it might help get LAN preference for transfers into more of the servents in use. Colleges can just cap P2P since the connection is supposed to be for academic purposes anyway (usually not P2P).

ISPs however are more likely to annoy their customers with P2P restrictions. Even though most people pay a flat rate, remote transfers cost the ISP per megabyte. ISPs are more likely to lose money due to file sharing customers with the greater Internet bandwidth use. It wouldn't be as big a factor if servents preferred local connections for transfers.