Another school of thought is that the higher the goal average in both match and league promotes more different score results and the probability of a draw is reduced. For instance, if the league average is for argument's sake is a lowly 2 goals per game, then to achieve that average some games will score higher, and some lower. Presuming you can allow +/- 1 goal, then you can expect all goal variations up to 3 goals per game. This then means that the probable results would be; 0-0, 1-0, 1-1, 0-1, 2-0, 0-2, 1-2 and 2-1. With those 8 scorelines, 25% are draws. You could probably improve on that 25% probability a bit by avoiding 1-sided matches or strong home favourites.
if you bet on games where the league averages are higher, you add more non-draw scorelines to the mix, but only adding the 2-2 to it as well. Bearing in mind that high averages will mean far less 0-0 results, you lose some of that draw likelyhood as well.
So based on that theory, you should look for even match-ups in low-scoring leagues, particularly with teams that are low-scorers.