So the trend in game and most will back this up, is zone chat has turned into trade spam. This is a direct result of the hefty cost to actually post items in a guild store. Kind of defeats the purpose of having trade guilds etc, if people do not want to post stuff on it because of losses incurred.
I understand implementation of gold sinks etc. But people are NOT gonna post potions etc for raid and pvp group items at cost for the guild when the tax and bank cut makes it a big loss. This defeats the purpose of having a guild store IMO.
The idea of guild store is awesome, allows a guild's crafters to sell needed items at cost without filling up valuable bank space. The gold sink cost needs to be revamped and looked at.