I think we should find win - win strategy, both for Nordeus and for players. Nordeus needs our money we spend on green and red boosters (condition and injuries) after "friendlies". We, players, need not to lose condition, health, and morale after "friendly" matches we have been forced to play by our "friends". We, players, also could stand not to gain experience if we were not forced to lose condition, health, and morale. But from time to time we would like compare skills of our team, team members, and our managing skills in real friendly match. I suggest divide Friendlies in two completely different kinds of matches:

(1) real friendly match:
after mutual agreement two managers will play this kind of match;
both teams are affected in both ways, positive and negative (both teams gaining experience and losing conditions, health, and morales like now)

(2) simulated match:
no agreement of opponent is needed, challenger will play match after inviting opponent's team immediately;
only challenger's team is affected (both, positive and negative, and players also received assessment of their performance in their cards), the invited team is intact (no gain of experience, no loss of condition, health, and morale, no assessment is recorded in players' card), BUT invited team receives full information about this simulated match

I expect that managers with golden heart will start play more simulated matches (now they think it is bad habit to force their friends to play "friendly" match), so Nordeus could be calm, they receive much more money, because players will start to play more than twice more these simulated friendlies which will lead to much more consumption of boosters.
Also, we have some very strong teams on our friends' lists and we would like to challenge them - now it is possible only for 4 teams to challenge them at maximum. I expect that there will be tens of challenges to these strong teams in simulated friendlies.
And lastly, I expect that if we start receiving match info, where we lost simulated friendlies we will also challenge our past challengers in simulated matches to show them how strong we are. And probably it will lead to real friendly match with mutual agreement.

So, if you believe my scenario, you see that spending of boosters will be same (manager One challenges manager Two and then he must spend boosters to get his team to pre-friendly-match state; in second step manager Two will challenge manager One to show him how good he is, and also he must spend boosters; may be it will lead to series of simulated friendlies), may be higher. And players will be happy, because they will not be force to play "friendlies".

Does not it sound as win-win strategy?