Apparently as high as $40,000 at Name.Com
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Is greed the reason these extensions are doomed to fail ??
No, for domainers they will fail no matter what the system. Doesn't matter how it is priced, nobody in the real world cares about any of this.
It is the duty of registries to try and suck as much money as they can out of people - that is domainers and the legal departments of medium/large corps. It is up to domainers to say no, unfortunately some people get fooled time and time again. It is very easy to sell something when people think they are going to make a lot of money. It is a bit like the ads for FX trading showing a picture of a beach, those guys are looking for fools and will find them, they probably should sell them on ntlds once they bomb out in currency trading.
Here is a good example (below) of this playing out in the domain space. Shock horror as people realise the registry & registrars are not on their side.
http://gtld.link/forum/main-forum/18161-donuts-increasing-pricing-in-oct-on-renewals