Auction MU values fluctuate because individuals choose to sell at prices different to the historical average. My view is that the recorded market history is inaccurate and misleading as it is only based on prices in auction. Some of the stuff I make hasn't been sold on auction in over a year. It's silly to make pricing decisions based on that information and so I pay little attention to it. People aren't paying for my bad crafting runs. I don't raise prices after a bad run. Nor do I drop them after a HOF. But both events contribute to my average cost to craft and can have a price impact in the long run. I think enhancers are a really good example of the market at work. Miners are choosing to sell the rare ingredients at significantly higher prices and this affects the cost to craft. Crafters are deciding whether to buy at that price or if it makes better sense to not make enhancers at that price. Those that do decide to craft the enhancers are choosing whether to sell at older prices for almost guaranteed loss or raise their selling price to allow them to sell at profit. Hunters are assessing if it is worth paying for the increased dps or if it makes sense to do without for now. Everyone making choices to arise at new consensus prices for a whole range of mats and crafted items. None of that process has anything to do with fair. Individuals make decisions about what is right for them.