Sold out slot: that issue happens without auto-mode. The auto-mode has diferent issue: you can't change item until it sold out
Profit per minute: Could you expain why the price is somewhat realistic? For example, a sushi box has cost 18, base price 27, and sells frequency 6 sec (with +56% speed, sorry I don't have a new vending mechine to test it). Why the profit pre min is 16?