People's ignorance can be astounding sometimes. Telling people they should uproot themselves from their homes to get access to broadband internet is reasonable, but asking for a relatively simple feature that has zero drawbacks is unreasonable.
I still fail to see what the purpose of disallowing LAN play independent of Bnet accomplishes other than pissing people off. Anti-piracy? Doubtful. People will find ways to play without going through Bnet if Blizzard chooses to ignore that portion of their fan base. The only difference is losing face with said portion of their fan base.