If this helps, in a warmonger game I never build banks, colosseums, cathedrals, and only rarely do I build temples. Only build libraries if you have enough beakers per turn in a town/city to make sure that 50% is getting you something. Even then, it still may not be worth it if you already are outresearching the AI. Markets are built more for the happiness than the GPT. If you are jacking up you tech slider, you do not benefit from any GPT because it is all going to research. So only build markets if you are either using a low-research strategy or if you have at least a couple of lux's so that you get enough happy faces to make a difference.