Had a friend total up her gains from "work from home" policy:
Improved productivity (no distractions from overly chatty coworkers, no unneeded prolonged conversations with "desperate to prove my value" middle management)
Second car ownership not needed
Less outside expenditures (fewer meals out, business attire)
Childcare costs eliminated
Reduced insurance costs
Healthier lifestyle (time for exercise, home-cooked meals)