Chateau frontenac is already a kind of diamond booster. diamond rewards are multiplied. If interested in BP, I am going to upgrade one in a few days in A.
yes and correct used you get with a Chateau level 10 more than 10 diamonds per day in the long run
lets look back to last years summer event
there was one quest reward with 250 diamonds
level 10 chateau increased that to 625 diamonds
so the Chateau produced 375 extra diamonds in that single quest
(lets hope that reward will be again in this years summer event
)
or the main story line has a quest with diamonds as reward at the end of an era
contemporary era story line: 200 --> boosted to 500 = 300 extra diamonds
postmodern era: 2 quests with 50 = 100 --> boosted to 250 diamonds = 150 extra diamonds
and hidden rewards in funny rinbin quests:
you remember the quests in CE where you had to pay 1 million coins and supplies which gave almost nothing back
if you did that quest the following quest gave 50 diamonds --> increased to 125 = 75 extra diamonds
and not to forget the recurring quests each era:
at least you can do following quest in each era
spend x fp, collect coins, collect supplies, produce x times in building y (3 different quests per age), nonbirthday quest
7 quests which each gives once 20 diamonds --> the increase from the chateau is 30 on level 10 --> 210 extra diamonds from the Chateau in those 7 quests in every era