It`s kind of big fun... You growing up,Your castle is getting better,but gold amount you getting form Your castle is the same all the time (when your other buildings giving you more,and more gold vile they grow up).Thats kind of joke,and i gess Moderators can take action and have discus about it,and every age,can inprove you daily gold reward (every new age 100% increase castle income). Also i think,that gold income is to slow,because,if you look at the production,they goes more quickly,but gold like hell slow. We need more gold to get (you spending on expansion,units,buildings) Take a look,and maybe you can think better way.
Hope my minds is not that silly,and Moderators will take some action on it.