PX/BX are pretty much a waste of real estate. Commissary is a very good value for most items. Even with surcharge. Only area in the commissary that is weak is produce.
Every other food category offers savings that beat our local supermarkets easily.
Class VI store has better prices than most on liquor and sales prices are not easily beaten off base.
I'd vote in a minute to shut every exchange store in CONUS. I think WALMART or another discount chain would be happy to operate stores on remote locations that require an exchange type store presence. I think the whole MWR/non appropriated funds system that is supported in part by exchanges should be looked at and modified to maximize value to service members not employees.
"The four most dangerous words in investing are 'This time it's different.'" - Sir John Templeton