Based on the website, it looks like their primary strategic advantage is ease of portability / shipping for off grid scenarios.

The fact that it is made of plastic tarps means there's very little specialty material that is needed to repair damage, unlike relatively fragile turbine blades that need a bit more care when shipping, frequent assembling and disassembling and weather, etc.

I'll go on record as saying that I don't think that those advantages come close to making up for the cost, and I'd like to think they plan on bringing the cost down significantly when they grow up... but I'm not really holding my breath there either.