@Prince of SeraphsOnce again. This is not a Mortal Realm. This is the Fae Realm. Bartering is very common to the Fae- No, It's a requirement. Fae may use a general staple to measure the worth of the more basic things. For example, stones weight of furs from Falk's Realm would equal a stone's worth of grain. While some would be happy to trade for that others may require something more to sweeten the deal and often would. Generally Trades are by amount and rarity/quality, generally.
Fact of the matter is, Fae don't generally Rule nations. Fae want something and they will scheme to get it. Only Four Fae rule nations and they do not barter so very often for their nation. Where humans would have problems Fae do not because they are not mortal. You're focusing too much upon the details and trying to figure how human they are. They aren't which leads the barter system to work. This is not a Mortal Realm with people needing payment for their work. Fae work and they get shelter, food, and protection. If working for another Fae generally they will get a small portion of the profit but this doesn't extend to the Ruler who Fae serve out of duty.
As for your second question, I answered that. Please what has been wrote prior.
Summary for those confused by large paragraphs:
I'm ending this debate. Here and now. Fae barter. Bartering is kept from going too extreme by the Rulers and their guards. Fae are not humans and thus certain problems do not extend to them. Fae can lie, but it is considered bad manners to do so.