It depends on the situation obviously, but at Deity you can stay cash positive (or almost) simply through tech & resource trading.
If an extra city gives you an extra tradable resource, it will probably pay for itself, and generate at least 1 Great Artist.
Also, in the late game when you usually get more religions, these cities can be very useful for building enough temples so your legendary cities do not need to build the temple, but can go straight for the Cathedral.
If an extra city gives you an extra tradable resource, it will probably pay for itself, and generate at least 1 Great Artist.
Also, in the late game when you usually get more religions, these cities can be very useful for building enough temples so your legendary cities do not need to build the temple, but can go straight for the Cathedral.