OK So I'm in Medieval, and in my order of progress, I first upgrade all of the offensive army stuff and research, then I move onto resources and then defenses, obv peppered with library techs throughout.
So I'm just finishing upgrading all the caravans and I've spent like a week of play upgrading farms and caravans up two levels each. In the current setup of the game, they add a little over a grand per hour each and that's ridiculously low for any use, let alone to bring back what you spent on them. In this age, you really have to attack and raid every day if you want to get anything done, so a few thousand is another few minutes of play.
Another reason for not upgrading them is to have less resources manufactured so you're a less interesting target to others while you're not playing. It's flipping tiring upgrading all the resource stuff when it does fcuk all.
So I'm just finishing upgrading all the caravans and I've spent like a week of play upgrading farms and caravans up two levels each. In the current setup of the game, they add a little over a grand per hour each and that's ridiculously low for any use, let alone to bring back what you spent on them. In this age, you really have to attack and raid every day if you want to get anything done, so a few thousand is another few minutes of play.
Another reason for not upgrading them is to have less resources manufactured so you're a less interesting target to others while you're not playing. It's flipping tiring upgrading all the resource stuff when it does fcuk all.