I just played a friendly (as host) because why not, lets test it
got 1+1+1 packs and 1$/spectator , all nice
however i noticed my players lost 10%+ condition (compared to 15-20% league games) while gaining roughly 1/5 the skill points they get in league games.
even if i woul dhave train them normaly they would have gained much more skill points for 10%+ condition loss
so basically friendly games are a waste of your players condition?
