Auctions house/Trade market easy solution

Now that Auction house/Trade Market is (semi-officially) coming soon™...

The solution to the costs is easy:
- Players don't trade with gold, the gold is the market's service fee.
- As with currency market: rare currencies cost more gold. The more currency goes through the market, the more gold it costs.
- Therefore, gold cost correlates with the offered item's listed price based on the currency.

Early game both gold and currency limits the trade.
Later game it shifts to currency limit (unless trading very frequently)

EASY! Now you just have to make sure that searching and filtering items work as well as POE trade site.