With what I have noticed about bookies, they really know how to make the odds perfect to how they will make money from people. Going for small leagues that you do not understand may even lead to more losses than going for big leagues that you understand. People only talk about valued bets, but it is not what it seems in reality.
The bookies are just doing their business they understand the game so well that sometimes they arrange an attractive odd to entice gamblers so that they will be moved to add a particular game to their slip but at the end the outcome of the game will not end well. The idea of going for small league or bush league as some may call it is not even a good choice cause in those leagues lies disappointments and uncertainties since the games can be manipulated.