You think the owner is taking the cash to the bank?? Unless they are an one-person operation, they likely have an employee do it (among their other duties).

Transporting and handling cash is absolutely not free, and unlike joe sixpack taking out $20k in a stack of benjamins that one time to buy a motorcycle with cash, it's much worse when

a. a lot of it is coins, so it's heavy and bulky, and

b. it becomes a regular thing that everyone on the street observes you doing over and over