From Deadspin today we have an interesting piece that confirms what many people who have tried betting on NFL games have probably suspected. The picks suck, with the only source claiming a 53%+ winning percentage that might overcome a sports book's vig not releasing a list of picks that could be used to verify their claims.
Deadspin's a little low on the why though. I'd probably suppose it may go back to the talent spread between NFL teams being much narrower than in many other sports. I rather prefer NCAA betting because the talent spread is more varied and early in the season much of the ranking and rating seems to rely heavily on the team's previous performance with players who have since left the school.
A lot of people try to seek profits from sports betting which is a questionable endeavour on its face. Betting to make games you already want to watch more interesting is probably the way to go about things. It may accentuate the sting of your team losing, but maybe start liking better teams?