Yeah but betting on small odds means that one slip up and you need to win 5-6 or more games in a row of these low odds 'favourites' games in order to recover. And if you for example take a look at Primera division, Barcelona have already lost a couple of games 
Bayern Munich is not Barcelona who relying too much only with a few players like messi and suarez because Bayern have many good players and if the odds is too small you can bet with a huge capital