A sure thing?

I found this at Physics Geek, and I'm thinking it sounds pretty good, I just want to know the percentage when dealing with a spread. Of course if you can make your bets with no spread then all is golden!

TMQ discusses what might be a low risk prospect: betting on the home team in this upcoming weekend's contests. Excerpt:

These points against gambling made, are you still looking for a sure thing? Try the home teams in the NFL divisional round this weekend. Home teams in the NFL divisional round are the surest sure thing in sports. Since the current playoff formation was adopted in 1990, home teams in the divisionals are 45-11, an .803 winning figure. The home teams have just finished a bye week and relaxing in hot tubs as their opponents are out in the cold while being pounded. Usually the reason the home teams had byes in the first place is that they are better than the wild-card round teams. Home teams dominate the NFL divisionals, so check-mark them in your office pool. You don't even need to know which team is playing! Just go for the home team in the divisional round.

That, my friends, is what I'd call a trend. Then again, no 8-8 team had ever won and NFL playoff game before last weekend, so your mileage may vary.