You could've said the same about anything related to "web" in nineties and we know how it ends, sooner or later. That doesn't make something economically viable

You could've said the same about anything related to "web" in nineties and we know how it ends, sooner or later. That doesn't make something economically viable on the long run. I'm all up to self sustained, "green" farming in impossible places, but 200M$ for a moderate size greenhouse seems way too much to be something more than an experiment.