I think what he's trying to say to you is that it probably has nothing to do with gilsellers whatsoever.
And all in all I don't really think it's the gilsellers that have raised the prices of the economy. Yeah, they camp NM's constantly and sell all their items on the AH but they're not the ones buying them. Whenever the gil sellers sold things, the prices used to remain fairly constant. They didn't really jack them up. But all in all, even if they did, someone else would too who wasnt a gil seller. Don't misinterpret this and think I support gil selling. I DO NOT SUPPORT SELLING GIL.
I think a lot of it is based on either:
A)The laziness of people who love to get everything from the auction house instead of getting it themselves, paying more for things they should be. A simple, yet minor example of this is a scroll of Puppet's Operetta. The scroll sells for roughly 18k from the nation in first, yet at the AH it was roughly over 30k last I checked. Granted, 12k really isn't that much, but this is just a minor example. You're paying 1.66% the worth of the item for the convenience of the Auction house.
So what's the relevance of this? Think of the items that are a lot harder to get, and how much people can raise the prices because of this. Is your skill high enough to craft a scorpion harness? And how many Venomous Claws do you have in your moghouse?
B)Unlike the argument of selling gil, I do believe the argument of buying gil does stand. The people who buy gil have a lot more money on hand, and they can always pull out their credit card to get more. They're going to care a lot less if they pay 1 million more for an item than it's been selling for than someone who doesn't buy gil. Why? To them, money is no object, and gil isn't either.
C)I think another possible factor is how many people now have high level jobs, and want to have great gear for their current jobs and successive jobs they level up. Take a look at how many high level characters there are on the server. As more and more people start leveling jobs higher, the demand for these items is going to go up and because of that the prices are going to rise.
D)Also take into account that raising the price of one item has a high possibility of raising the price of other items as well. If you raise the price of materials, the price of those crafted items are going to go up as well.
In the case of food, all of the ingredients have gone up in price because so many people are cooking now. A lot of people, especially mages, level cooking so they can make juices when they party. Also, as food gets more popular, the price is going to rise because more food will have to be made, and more materials will be required to make that food.
I could go on but I don't want to make you all read my rant. Simply put, people can be really greedy, and the need for items can really drive the prices up.
Feel free to rate me down or whatever if you don't like what I've said.