I think what he's saying is that your end user is a Domainer and Domainers tend to be cheap or at least expect to get names at a reduced/wholesale price. The .net does greatly reduce its value I'm affraid, I myself arnt very keen on developing a .net when I dont own the .com
As far as its value as a developed site well that depends how much work you plan to put into it, features etc... traffic, revenue...