I received 5 coins and a WE flask.
Amazing they tell us not to farm for coins (I didn’t) and then give out different amounts for participation. 
I got 20 coins too.
Guess this is one time I benefited from having to replay a few times to stay in my target tiers…
I got only 10 coins
I’m fine with 5 coins and a flask. I’m not gonna try for any of the Opera Legendaries anyway. Thanks!
I am, too. Hell, I was fine with zero. But try doing the same thing with your kids. Tell them coins are gone and then give them different amounts based on participation after the fact.
How’s that going to fly? 
Amazing that Zynga will expend effort to calculate “participation level” to decide challenge coin “compensation” but Zynga will not expend effort to communicate their policy on this compensation.
Is Zynga that unaware that players will share and discuss in Forum, various group chats and in game chat ?
Has Zynga not learned that their preferred communication mode encourages further distrust ? 
FYI: 20 coins. No idea why. Received 2 S1 3*. Whatever.