There used to be very good value playing any team to convert a fourth down. You used to be able to find it at a small plus or at worst, pick em or a small favorite. When a team would have fourth and inches, they would QB sneak it to convert and then in the fourth quarter the team that was behind would go for it on fourth down.
The books have a made a big adjustment and now you see it put up at many places anywhere from -180 to -220.