How many people keep a few vouchers from the casinos they play at while in Vegas? If it's 5 cents 80 cents 3 cents etc ....I wonder how much the casinos make just from this. I usually leave my voucher on the machine hoping the next person will use it. We counted up what we took with us the last time, and between us we left with 13 dollars from random places. I can't imagine what casinos make from this alone.