I am currently in the modern era and up to now gold was quite balanced. But now I am getting into the negatives although I construct all the gold giving buildings including all the wonders that give +10% gold everywhere. I think that typical gold buildings don't give enough of it while other buildings like science buildings are too expensive.
Some examples:
Vacation Resort: +1% net +1.02
Casino: +1% net 0
as it replaces Gambling Hall
Retreat Center: +5 net +11.35
Comedy Club: +3 +Free Celebrity net +16.29
Deep Sea Lab: -100
Culinary School: -30
High Energy Lab: -100
Military Satellites: -10
Bancruptcy is immenent! I would suggest to either have the costs of the science and food buildings halved or double the gold revenue for the ones that provide cash! That is only for modern era, everything up to Atom seemed to be fine.