It does, because the tax office very frequently sends undercover inspectors to buy something in your shop, and if they don't get the receipt they will fine you huge sums of money. My employees certainly have it drilled into them that any customer could be an inspector and they have to offer the receipt to everyone.

And yes, of course - the tax office inspectors are doing this to make sure that taxes are paid on each sale - but it has the added benefit of making sure that the money for each sale is actually going in my register, not in the pocket of my employee.