I was watching Marbozir play Vox Populi, the video is dated from August 8th of this year. When he began a Golden Age with Brazil he went from 16,983 gold up to 27,547 gold. This was during an Industrial Era war with Montezuma (turn 424, Epic speed) and he was able to purchase Field Gun's instantly for 790 gold. A Field Gun would have taken 20 turns to produce in one of the cities he purchased one in. I feel like if you had a good amount of gold and you spent a substantial amount to purchase a Field Gun that'd be OK, but Marbozir was able to constantly just keep instantly buying units without putting a dent in his gold. I mean he had 27.5K gold, 790 gold isn't a big chunk of that. It's almost like "why build units at all?", all you have to do is keep purchasing them with that Golden Age money. 3 of your units got killed in a single turn? Normally that would put a big dent in your war effort, but when you can purchase 3 more instantly for 2.4K gold, less than a tenth of your total gold amount, it's not a big dent at all. I feel like building units should take resources from your cities, production to build them. That production could have been put into buildings or wonders, but you make a sacrifice when building units, a necessary sacrifice most of the time. But if you've 10 cities, then hit a Golden Age and can instantly purchase 10 units with that money you got from the Golden Age, and still have money left over and making 250 gold per turn. I'm not a fan of that system.