@gutmeister Something else to consider is that, along with the fact that any goods can be traded among players regardless of the age of either, producing better goods is not the only reason to advance in age. Unlike goods, troops and buildings cannot be traded, so the only way to acquire them is by advancing in age. And since this is a multi-faceted game regardless of playstyle, these two significant factors cannot be ignored as part of the bigger picture.
An LMA camper will trade 1:1 and probably even up to 2:1 with any HMA player because they're going to have the stock to do so. Shifting the age upwards by one doesn't invalidate the point I was making, because you're making essentially the exact same point: Someone with a surplus of goods is most likely going to trade at 'devalued' rates because they simply have more than enough stock to do so, regardless of what their ideal 'value' might be. This applies to ALL ages.
Think of it like this, if it makes it easier: Everyone who's in OF is effectively camping in OF. Functionally speaking, this is no different at all from camping in any other age, and yes, there are players who've camped and are currently camping in other ages (that aren't at the end of the tech tree) for LONGER than OF has been available. So from that angle, why's it 'wrong' for OF goods to be allegedly 'devalued'? That's just what happens when you camp, but that also doesn't mean there's a problem. Just like the HMA camper who'll trade at whatever ratio allows them to acquire the goods they might need regardless of what HMA goods are normally worth, OF players can do the same. It sounds to me like you're still hung up on your belief that goods should always have a 'minimum' value regardless of how many someone has, but that's just not how it works. In fact, I'll suggest that you may even have it backwards.
Here's a possibility: The 'problem' isn't that OF goods are 'devalued', it's more that the lower-age goods that they might want to trade for are in too short a supply. Let's go hypothetical here. If you completely zeroed out the entire game's inventory of OF goods right now, do you think that would have an impact on being able to trade for AF or FE goods? I personally do not. Here's a fact: When you aren't getting them for free from buildings like the Oasis or Terrace Farm or quests, refined goods are pretty annoying to produce. You now need up to four different goods buildings in order to maintain supply to keep producing a single type of refined good. Only three in the case of AF and FE, but that's still a huge expenditure of both space and population for each 'set' of buildings you want to run, but if you're above the age of the goods you want it's your only other option besides trading for them. Most players do not go the production route, leading to a shortage in supply once they leave the age where they're able to receive large quantities of the goods without actually producing them. I posit that the 'problem' here isn't OF goods being too common and not very valuable, but that there aren't enough AF or FE goods and that players should start producing more of those themselves rather than trying to trade in an increasingly-shrinking market.