As materials and methods become better developed costs will drop. This method saves water, fertilizer, and land area while allowing year round production with little pollution.  No production loss to freeze, hail, drought, or a plague of locusts. These are great for fresh food like lettuce but will not replace a form for something like wheat.
An interesting article on method and costs: https://blog.brightagrotech.com/vertical-farming-costs-and-the-math-behind-them/
For things like wheat flour algae bioreactors may be used.