Friendly matches are part of the matches that are difficult to predict. Just like you have said, it adds nothing to the team. Don't be surprise if the underdog win the match with their big odds. I do catch cruise with games like this sometime if I have some extra cash. I will just pick like 5 friendly matches in which I will place bet on the underdogs individually as a single bet. If just one of the game win then I still win big. Although this is risky but worth trying once in a while with little money that you can avoid to lose.
That's too risky, it's true that friendly matches are very difficult to predict and sometimes even the favorite team playing with its full squad is unable to win the match, as happened with Bayern Munich against Basel.
I was a little surprised by this result because Bayern Munich played almost all of their main players but their performance was quite bad and this was just a friendly match and didn't mean anything for both teams.
Of course, betting on friendly matches will be difficult because it is not uncommon for predictions to be wrong. It could be said that it is difficult to predict even though we know that Bayern Munich's quality is better than Basel, but that doesn't mean they can win. So it is not surprising that the friendly match against Basel ended in a draw even though in the first half almost all the main players played but could not win the match because they played without motivation and without pressure. The most effective friendly bet is to go against the bookie's current, don't follow the bookie's Ods predictions.