I put a quarter in and it registers $.025. So far so good and as a bonus, I get the quarter back in the change return, so I can use it again. $0.50 registered. I put my 5 dimes in and $1.00 shows and I can buy my goodies!
Now lets see. I lost $.020 cents on the first round and gained $.025 on the second round! I'm $.05 cents ahead! GDJ one, vending machine zero! :-)