You know why the best deals are found in the outlier area's? Because the trader bid is low enough so that the guild doesn't have to force it's members to over price items just make to make a high sales minimum. So whether your guild is in a high traffic area or not your members may or may Not make more gold, depending on what the guild requires of its members. I'm sure that some guild masters are only in it for the gold that comes to their pockets, not how much they can help their members make. There has to be a happy medium where the guild AND the members are actually making gold. The only way I can see this happening to put in more trader kiosks. There are plenty of places where that could happen. All the capital cities have room for more kiosks and that certainly would reduce the cost of the traders in those area's. But look around in the game and you will find places for more or new kiosks everywhere. As the game ages there are bound to be more and more guilds and I feel the number of trader kiosks needs to reflect that. The only new trader kiosks that have been added since the game came online are the few that were added with the DLC's and oh hey, they added 1 trader in each outlaw refuge! Cause everyone wants a trader there. As it is now if you lose your trader bid, there are NO other options than to wait until next week, since ALL trader kiosks are full.
Not true. No one forces people to overprice items, guilds force them to sell a lot of items instead. Can hardly call it "forcing" since that's why they are in a trading guild to begin with. You find best deals in the outlier areas because those guilds are poor, don't have requirements all that much and therefore have a lot of noobs. Like, I saw kuta and aetherial cipher go for less than 100g. It's not deals, it's players who didn't know the market and that they could change the price of their listing.
OP, what you encountered is normal and natural. Look at it from a different angle. Other guilds couldn't get your guild's trader before consistently. And they were upset that the prices are high etc, while your guild would win the bids. Well now things turned so that they made/raised more money and can afford to spend more than you.