Would it be more cost effective to house prisoners in coma centers?

Seeing that medical personnel can place people in comas and bring them back at will, would it be more cost effective to have prisoners serve out their sentence in a comatose state? The food would be easier to prepare, less use of manpower, less bouts of physical altercations, discipline problems, and theft. Now, business will get pissed because they will lose millions on selling goods to the inmates, except when they are revived for their visits. Overall, the cost would be less, so would it not make more sense to run a prison that way?