Assuming submitters don't modify their logfiles then it would indeed be a legit measure of the prices of items that have sold. I just have to ask, "Why"? I mean, I don't see C happening because actual coin seller live market prices fluxuate based on time-in and quantity as compared to competing organizations. If you are trying to decide what to sell an item for and it either doesn't exist on the broker or it is there but is up for something you consider to be ridculously over/underpriced, you'll likely either vendor it, hold on to it until later, or just pull a reasonable priuce out of your head rather than window out of the game, open a browser, navigate to the market site, pull up your server, and search for the item. If you think someone trying to sell you something is attempting to rip you off, generally a quick question to #your_level_channel with, "Hey is X really worth Y" will get you your answer. Additionally they have <400 users submitting log files out of possible thousands, spread out among the servers. I wouldn't consider that a real represenative sampling of market trends anyhow.