Bryan,
I used to rent space in a Mall for my Salt and pepper shakers. I paid $30 a month for a medium size glass case. Yes, they charged a commission. I didn't have to worry about anything as far as credit cards. The place I was at was not responsible for any loss. I had one set that was stolen, although I'm not sure how, since they had to open the case with the key and were not suppose to leave it opened. They claimed to know nothing about it. I would ask the question about their responsibility as far as loss.
Hope this helps.
Carol