I would like to see something like that as a special mechanic for grigori, all GPP pooled and then GP is spawned in captol. If that is possible, I would really like that, it is better than generic increasing of GPP via buildings. Not to say how big advantage would it be for Grigori: Just create 1 mercahnt in each city and you have Great Merchant (Or Adventurer) in just few turns! So large advantage, that GP spawn poits should be doubled from 100/250 etc to 200/500... and they would still be powerful and unique