why? Because as a society we value maximizing profit over anything else. The money that's saved by making you do a server/cashier's job is meant to make more money faster, at lower cost to line owners/shareholder pockets with more dividends, not to give you a fairer price or pay staff. Besides, why give clients a 1% discount to do work they'll do anyway for free instead of paying an employee to do it? How is a company supposed to accumulate capital if they redistribute the benefits of technological progress to all involved in the transaction? /s