Paying for a singleplayer campaign is retarded unless you're trying to support the company.
You'd think that would be obvious by now.
I'm confused by this. If you mean torrenting it, singleplayer can only be played while connected to bnet. There is no offline mode in SC2 (well guest, but you can't save anything).
Blizzard will get my $50 for this game, its pretty awesome. Leagues are where it is at.