Pleasure is mine.

Regarding dcity.

1. Forget about education, not worth it, you can buy the required tech easily.

2. Invest everything into SIM production & popularity. There will be a point where u won't need more population buildings as the popularity multiplier hits +150-200%

3. Don't really need to buy new random cards. You can get whatever u need from the market (and for much less).

For example, a 'basic home' or 'luxury home' from S1 costs '4 HIVE' if you manage to get it from a purchased 'random card'.

But they're at 1,8-2,3HIVE at market rates. (Yes, you got the same building with a 50% discount, you get my point).

Solely playing on this strategy my city is very profitable, because the minimum costs have been cut to the bare minimum while I maximized production.

It's also very recommended to have a second city to store here the unused cards that you might get. For example, I hate the casinos. The income that they bring to you is not worth the 'possibility' of being robbed for 400 SIM.

Hope that helps :) def the game can be very fun and rewarding