I see two advantages the trading fee has:
* Players cannot wildly place and remove orders on the market and adapt their offers immediately to newly placed offers from others. Before the trade few was in place, this had led to obscure situations and made the market difficult to use, since you knew that placing a buy offer would quickly make others enter one themselves offering 0.1$ more for the respective resource - so all the achieved by placing buy orders was to increase the market price for the resource you need. Same issue for sell orders. This someties created an ugly deadlock on the market, which the trade fee resolved.
* Very few, clever players used to "hide" their resources on the market just the moment before one of their resource provinces got conquered. Afterwards removed that order again so they passed this moment without any losses. This could also be resolved by the trade fee.
On the other hand, the trade fee as it is at the moment also has one big disadvantage: Players who rightfully want to trade are hindered from doing so on the market to some extent. Many players consider this to be very annoying and I also would prefer a more active market.
Suggestion: Don't charge any fee if placing or accepting an offer on the market. Instead charge 10% or 20% if removing an own offer from the market (after click on the "X"-button for removing the order, show a confirmation popup mentioning this would cost the fee).
This solution would maintain both advantages of the fee and make us get rid of the disadvantage.
* Players cannot wildly place and remove orders on the market and adapt their offers immediately to newly placed offers from others. Before the trade few was in place, this had led to obscure situations and made the market difficult to use, since you knew that placing a buy offer would quickly make others enter one themselves offering 0.1$ more for the respective resource - so all the achieved by placing buy orders was to increase the market price for the resource you need. Same issue for sell orders. This someties created an ugly deadlock on the market, which the trade fee resolved.
* Very few, clever players used to "hide" their resources on the market just the moment before one of their resource provinces got conquered. Afterwards removed that order again so they passed this moment without any losses. This could also be resolved by the trade fee.
On the other hand, the trade fee as it is at the moment also has one big disadvantage: Players who rightfully want to trade are hindered from doing so on the market to some extent. Many players consider this to be very annoying and I also would prefer a more active market.
Suggestion: Don't charge any fee if placing or accepting an offer on the market. Instead charge 10% or 20% if removing an own offer from the market (after click on the "X"-button for removing the order, show a confirmation popup mentioning this would cost the fee).
This solution would maintain both advantages of the fee and make us get rid of the disadvantage.