If Green Bay, Wis., a town of 105,000 people, can raise $70 million to rehabilitate its football field by selling $250 stock shares, I bet $250 there’s a community in America that can raise $2 or $3 million for a broadband network. Any takers? You might think that, given the Green Bay Packers’ history of winning seasons and how much revenue the team generated this year even without going to the Super Bowl, $250 in Lambeau field is a sound investment. Until you realize, as one blogger noted,...