I dunno - outside of the cores which are -blam!-ed up - the rest of his stock is very easily manipulated over a few days for big gains in every other thing. I find myself dumping glimmer into materials/shards - then I eventually use those to mitigate the rising costs of cores in a day - it also helps his bounties pay out nicely in glimmer for the short time they take to complete. Cores are out of control, but the rest of his scheme is quite alright by me.