Having worked at a movie theater, I can tell you that the answer is “by a human”
If you can make a machine that cleans a popcorn popper well enough to pass a health inspection, you’ll be a very rich person. Especially a small vending-machine-sized popper-and-dispenser all-in-one jobby.
Because that’s the price that (most) customers are willing to pay for them 🤷
But, if you account for inflation (using the BLS website ), $50 in Jan of 2011 is equal to a little over $70 today, so a $60 used game is kind-of a discount?