As I stated on Discord just before the screenshotted part, the possibility to get overpowered items is not a concern if there are a level requirement on gear.
I understood (hence it possible I have misunderstood) the devs plan to have a level requirement that is not present yet as it is still a quite early alpha state of the game (but there are already some items that start dropping later).
With a level requirement, you could buy powerful stuff for your alt but couldn’t use it until you played enough with it to reach the required level.
Then, even if there is no level requirement, the “bazaar coins” wouldn’t be of any help with this concern as you could still farm those with your main and buy all the items you want with your alt.
Moreover, those “bazaar coins” are quite redondant with gold:
- you get some by playing
- if you spent all you had, you can’t buy thing at the baazar until you got some more
There is an entropy on the “bazaar coins” as they are kept by the bazaar on transaction. But it’s really common mechanics to have an AH get a tax when you add an item to sell (preventing to set a price too high as you would lose money if it’s not sold) and again on the transaction.
So you already have everything OP stated whitout adding another currency (and all the difficulties it brings).
The real issue is how to limit exploit of the Bazaar. And, preferably, doing it without preventing people to have fun with trading.
But I do believe what was presented already goes in the right direction and can do what is wanted with a few itérations (and without a special currency):
- You can’t sell to much things at once
- You have to wait for the auction to end to get money
- You are limited on how many bids you can have at once
Trading with the bazaar will take time and you won’t be able to do too much operations at the same time.