So it seems the in-game value is different than the ebay/reseller values - so adjusting bin to what I see on the in-game auction houses that I can easily view.

So current bids are 850K to 925K of in-game gold.
If I discount to 800K in-game gold, and look for a rate of 650 fg per 100k, that get's me to a value of 5,200 FG.
Updated bin of 5,200 FG based on in-game economics.