Inmates are charged a certain amount each month for their cell, food and clothing from what I understand.
Unfortunatly my BIL was in Fremont down near Canyon City for awhile for a really BS reason (another thread) and I gave him money as did my Dad and Sister to help pay for things there and also to pay for his fees there for being there.

He worked in laundry I think and made something like $12.00 a month or every 2 weeks, I forget, after he paid his monthly room and board so to speak.

Even when my Sis went and visited him, I still wouldnt be against this fee for her to visit him, but I think she visited him a dozen times in 4 years. I dont remember, just remember doing all I could to raise my nephew during that time.