Think what a lot of crafters forget when it comes to this type of business sealing is that in truth the market board valuation is only showing what an item is worth from one persons perspective, so 1 crafter buys the mats and passes cost on, others get their own mats so the 2 valuations are very different. Fundamentally my personal view is that its a video game and anyone who gets bent out of shape as a result of imaginary money should get out of the house more often.