relax soon enough (ok maybe not soon enough) you'll be making all these products at home. 3d printing will take care of most of your needs.
Buy a design in the morning, print at home, or at the nearest walmart print center. Go kiting in the afternoon. Once you are done, stuff your board back into the machine and recycle to make another.
But from where the raw material (f.ex plastic) is coming to your 3d printer? Or if the kite is sewn in USA but from where the fabric is originating? How much energy does it cost to recycle, clean and process old plastic used as a surfboard?
Producing goods is much more than final assembly.
How much in the kite's price is because of materials, production and final assembly? Only people like Dimitri knows the truth.
What portion of kite's price is salaries (mother company employees, fully sponsored riders), rents, marketing, returns, defects, tax, "accounting company", shipping costs (factory to sales). All must be included in the price of kite/board/goods. And some profit for the owners of the company.