Let me correct you a little in this one. The reason for that ppl don't use cause amp now is that the dante amp exsist. Haven't the dante amp exsisted, ppl have used cause amp (or similiar) today. This is same for many items in EU. Ppl talk about some items like there was "crap" items. The only reason for that the items is "crap" is that there exsist other better items. I even once heared somebody talk about FAP-90 as a crap item, near as bad as Adj Fap. That was some years ago though.
When Dante amp was released, I think I remember the price at around +1500 ped. Reason for high price was monopoly and that NZR still didn't have so good crafting skills as he has today, also QR of bp was 1.0.
Dante amp require azzurite ingot to be produced. Back then, azzurite was at 150%. Now azzurite sell for much higher.
I don't know how much it is fair to sell dante amp for, but I think NZR gain ok from his investment. About speculation, I really don't know where dante amp will be in price range in the future. It can depend a lot of the resources required to make the amp. As for coats, I remember when they stop to drop in loot, price skyrocket. Some after, tailors unlocked blueprints and started to produce coats. It was then possible to get a coat for a "good" price. This occured until some resources was harder to find and the crafted coats also skyrocket in price.
About resellers, I think we can divide them into several groups.
1. Simple resellers. Those who stay all the day in auction and buy stuff when it is under "marketprice" for later sell on marketprice.
2. Speculators. Those who buy stuff and put in storage for speculation purpose. Example Uber armor, Uber FAP, items that drop in cycle, etc. When price raise, they sell it.
3. Traders. Those who buy resources in bulk from miners and hunters and sell to crafters and tailors for a little markup to provide service.
All those participate in EU economy in a way, same as in IR:. Since the economy in EU still is in a "start-phase", it is possible to manipulate to a certain grade. Anyway, I think it is possible to avoid resellers (group 1) for ppl with patience. It is patience that those gain on.
/Kjetil