(RPG/Factions) Auction house - lists currency as "coins"

In the auction house, prices are listed as "100 coins" for example. I don't think the in-game currency is listed as "coins" anywhere else (at least in Factions, but also likely RPG). The in game currency is typically listed as $ (dollar symbol), on the sidebar and /bal for example. (also in the case of Factions, add the $ sign before the price to be consistent)