Exactly. I spent 40 days in prison once, on a cell with 12 or 13 other dudes... I would gladly take the isolation. I would lose the dozen or so blunts I smoke with some of the cool dudes with whom I had common friends, but I would be first in line for that isolation and some books.
Thanks for bringing up another important point: today's prisons are rife with drugs. Won't be easy getting drugs in my prison, so everyone will come out clean.