The Ibanez Edge is exclusive to Ibanez and - as middle-man - Ibanez can charge what they want for the product made by Gotoh.

 

I personally think the edge trems are superior to the Floyd Rose. Also consider the Edge is produced in far fewer quantities than Floyd Rose, as the edge is exclusive to Ibanez. It's all about economy of scale. It costs less per unit to produce 10,000 units than it does to produce 1000.

 

Gotoh's Floyds are stamped steel baseplates, Ibanez are cast. All parts of the trem are proprietary to Ibanez so as snagg stated, economy of scale also plays a role, but it is a costlier trem to produce, and Ibanez has to pay what a Gotoh distributor would have to pay, and then mark it up to a distributor. And bottom line they have an extremely good reputation so command a premium because people will pay it. If nobody bought them they'd have to reduce the price. But by having it all proprietary if you need a lock block they list for $8, fine tuners are $9, a saddle is $27. You can buy a full set of complete Floyd saddles for less.

I've rejected lots of trems for scratches or other blems in the finish and used to always get a hard time, and my standard answer was 70% of the guitars they sell cost more than this part, if you want me to sell them they can't have blems.