Update: To clarify -- There's an audience for these things who will pay $3,750 for this. They're cash-rich and time-poor. There's another audience who will never pay $3,750 for one of these, but might happily spend a year putting one together in their basements: time-rich and cash-poor. The time-rich people would likely never avail themselves of a set of plans for this, so a set of open plans would not displace sales of the costumes, but it would encourage a generation of cardboard hackers who'll go on to deliver new and better costumes in years to come -- it's the best of both worlds.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.