How so? No charge backs, no fraudulent transactions, no paperwork. You have the money right then and don't have to wait for some transfer a few days later.
- employee mistakes
- dealing with the float: counting it out, counting it back in
- having to store it securely
- having to transport it securely
- paying to pay it in at the bank (cash deposits are not free)
- increases risk of getting robbed
- actually getting robbed and having it all gone
