The classic profitable pattern (the “Wong teaser”) uses 6-point NFL teasers on legs that cross both key numbers 3 and 7: teasing -7.5 down to -1.5, or +1.5 up to +7.5. Because NFL margins cluster on 3 and 7, those 6 points capture a disproportionate share of outcomes. Teaser legs that don't cross key numbers are generally poor value - the fixed payout reduction outruns the win-probability gain.
Evaluating a teaser leg is an alt-line problem: the teased number is just an alternate spread, so compare the book's implied teaser pricing against the alt-ladder prices for the same number from the catalog at /v1/meta/markets.