The house hold on those Western conference lines was a whopping 17.5%. It's kind of difficult to be a "scumbag thief" betting into a line with that much vig. And in any case, what are you supposed to do when you ask the book "Are you sure that line is ok?" and they tell you "Yes?"
Since offshore sports books are unregulated they'll do just about whatever they want and get away with it. The Nevada sportsbooks put up similar lines with awful vig but at least their legally required to honor tickets as written.