Thank you for that Boz. But your comments about house edge and +EV are just wrong. House edge does not necessarily make a play -EV. Take blackjack. There is a definite house edge. But card counting and other AP plays can and do overcome that house edge and make the play +EV.
In this case, yes, there is a definite house edge because of the juice. But the likelihood of lines being wrong, under and overvalued in the early weeks, can over come the house edge. And it is the data that proves that.
Take Wizards data. (forgetting your dislike of the man). Wizards data show for something like 17 years, every NFL game, that betting underdogs show a small profit. That is thousands and thousands of games. That is NOT a trend. A trend is The cowboys have won 5 of last 6 meetings.