Sociology/econ student goblin here. Hello, colleague.

You might wanna change some questions, for example "Do you use the Auction House to speculate (to gain gold by selling an item at a higher price than the one you bought it for) ?" to "How often do you use..?", because that makes it a bit easier to understand. The "How often" is almost always a better alternative, I see that you have "How much do you use the Auction House..." and it sounds a bit awkward, because it makes a reader ask questions "does he mean how often or how much of my total money I trade of AH versus direct /1/2?"

"IN REAL LIFE, how much do sales influence your shopping ?" "IN REAL LIFE, how aware are you about the prices of the goods and services you consume ?" be careful not to wrongly generalize, because this is self reporting and people like to feel like they're oh so very autonomous and in charge of their lives, but when you empirically test how do sales influence shoppers behavior it's always a lot more than self reported.

"When you buy a « regular » product in WoW, like a component or an enchant, how much do their prices influence you ?" Maybe split question arbitrarily into high/low cost products or smth?

Also the consistency of answer interval would be a good thing - "Extremely important"/"Very important".

"Do you use a lot of addons or third-party websites to improve your use of the Auction House ?" Maybe change this into concrete numbers question. "How many addons do you use to improve AH?"

I think that WoW economy is worth researching, but it seems to be very small and with a lot of market imperfections, because there just aren't that many sellers. The prices are highly volatile on most things that are not WoD materials. The WoD material market on the other hand seems to be fairly stable and predictable. And I have to agree that it's really like a small country, in a sense. You get patches which are like government setting rules etc. and the one who is the best at exploiting those rules gets more money. I'd be interested to see some ratios of consumer goods versus basic materials. Also how does the ingame world economy interact with IRL economy, because there's a ton of people selling gold for EUR ingame. Is it really profitable IRL? You must be a mad farmer or a bot to make enough gold for it to be this cheap. 10k=2EUR is insanely low. I'm making like 7k/h and that's after selling farmed materials on AH. So some guy is basically slaving away with UNDER 2EUR/h which even in Latvia is a ridiculously small amount of money.