It’s not, though. We see this in PoE1 and even in PoE2 where they still haven’t quite gotten a handle on things properly.
In PoE1 you have a massive influx into the market for a couple of weeks and it starts going down from there. When you join the season 3 months later, you will still find everything because everyone has fed the market massively with thousands of items in the first month.
This doesn’t happen in LE because the market crashes very fast and everyone bails ship before it has a chance to happen. Many already know MG has these issues and they don’t even join it to begin with (or even play the game, if trade matters that much to them).
This isn’t amplified by CoF. CoF just lets those players keep playing. Otherwise they would simply leave.
Because you would have to not be able to use any of the items you had bought with MG, so you would have to start over from scratch.
Because CoF doesn’t actually work that way? For one thing, CoF will have a much harder time getting specific uniques, especially if they’re rare. You can get a red ring much more easily in MG than in CoF. In CoF you’ll do dozens of ring prophecies until a red ring finally drops.
If you want to farm a 2LP Sword Catcher in CoF using prophecies you’ll need around 200 prophecies. And the one that finally drops is likely not going to have a good roll.
As I said, the problem with LE’s trade is that it crashes too quickly for it to be fed early on in a way that lasts the rest of the season. Which is what happens in PoE. The sweatlords flood the market with good items in the 2-4 weeks they play. Then they leave but the items are still there. And the market keeps adjusting and self regulating because everything used to trade is perishable and consumed during the course of the season.
You don’t get that in LE. You get a very quick inflation leading to a quick market crash, players bailing out before the market is sufficiently supplied with most things and then you have a small percentage of players left there which aren’t enough to sustain it anymore.
MG does need a fix. But it’s not by forcing people to trade that you’ll fix it. That will just alienate the portion of the playerbase that is actually happy with the game and cause them to leave.