Prices on items are always at their highest when new, then the novelty wears off and you cant sell them!
I have seen the moonstone crystal shards (ingredient) that you collect from the Myrmidex warriors on a vendor for $13m each and you need 5 to make the Kotl.
I have seen people trying to sell the Kotl for $90m (not sure if anyone actually paid this amount though) and the Kotl does nothing, just deco.
*Guess it is worth, whatever someone is willing to pay for it!*