You may just end up with the "tipped cashier" effect where wages are driven down on rationale that they will be tipped. Now if you buy a self serve coffee in a

You may just end up with the "tipped cashier" effect where wages are driven down on rationale that they will be tipped. Now if you buy a self serve coffee in a paper cup the cashier whose sole job is to take your money, expects a tip because their wages are shite.