Hi @pfunk,
the city has two income streams. One in Hive (which we collect for real donations) and the other is SIM (which we use for development)
Sure, the donations are income stream 3, but this comes by random. I just donated some more stuff to buy more cards.
My next goal is to have an income of 1 Hive each day with the city.
Therefore I will do another donation to keep it going.