Raiders,
Short version of 6 point tease is
NFL Home favs 0f -7.5 to -8.5 covered 79.8 percent 1990-2000
NFL visiting favs of -7.5 to -8.5 covered 76.2 percent 1990-2000
NFL home dogs of +1.5 to 2.5 covered 82.2 percent 1990-2000
NFL visiting dogs of +1.5 to +2.5 covered 73.5 percent 1990-2000
Math wise 2 teams that covered 76% of the time alone would cover together 57.9 of the time (which is needed to win the teaser) Break even point on that wager is getting -137 for a 2 teamer or +127 for a 3 teamer. Offshore you can get +100 on a 2 teamer and as high as +185 on a 3 teamer.
1990-2000 evidence shows that 6.5 & 7 point teaser are also profitable. Ex. Tenn -9.5 teased to -2.5.
Couple that with you CAN be selective and some offshore books will allow you to leave open slots and close the bet a little later, giving you more game options and you WILL be successful.
I prefer the teasing of only 2 teams and I am consistent with the wager (basically incorporating flat betting into it)
Word of caution 3 & 7 is not as key in college and the principals can not be blindly followed nor do I have college data to test. Perhaps someone else has the data.
I have also read many have tested the NBA teasers and have not found any successful long term wagers.
Big Lou says the NFL playoffs is the best bet there is. Bullshit I say.
Its NFL Teasers done correctly.