Should the service fee by high or low? It could cut either way. A low service fee encourages withdrawals and thus gambling, which is profitable for the casino. A high service fee takes in money from the desperate and those with high time preference.
It was $4.99. (Of course that is n = 1.)
On the other hand, they let you take out up to $1000, well above the average.
Another user told me you are especially likely to get $100 bills from the machine. Perhaps the hope is that you will buy $100 in chips rather than trying to break the bill.