It is important to have your department stores always at the highest level in order to always redirect, relocate and transfer most of the goods. It makes little sense to always level the Rarhaus alone, if the other buildings are neglected, such as department stores and the ship dock. The museum should not be forgotten either, as it donates steadily gold and personally like to watch my ships set.
Who cleverly deals with his diamonds and does not use them senselessly, can achieve a lot in the right places. Including investing in ships, if tonnage and crew are consistent with the dockyard. Unfortunately, it does not matter how many ships you have, because these can only be used to a limited extent via the dockyard.
Captains should be used skillfully. Big compliment to the above example, how to do it perfectly. However, this also comes with less funds, because who feels cleverly his department store, it can easily not as much as in the past but also overcrowded properly, without spending diamonds or money.
It does not mean that you should not support a good game financially. Developers should also be paid for their work, as long as this does not manipulate the game. (Pay2win)