I think the price of Nex armor is eventually going to drop due to the updates for all of the other armor. The demand for the armor will decrease, resulting in less buys from non-flipping players, which will in turn cause flippers to have to decrease margins, which will cause prices to decrease. Another factor is the increase in supply from Nex kills, which will also decrease the prices.
Item(x) = Price(x)
+(x) = -Price
What this equation says is that an item times the number on the market equals the price of one item multiplied by the number of items on the market.
As the number of items increases, the price will decrease.
Now, I say number of items on the market because items that aren't being traded aren't effecting prices (ie. Price manipulation)