PC World's peculiar absence of customer loos

Let's get this straight. Your average branch of PC world isn't short of space. Generally it's to be found in the middle of an industrial wasteland, with no other loo for about 600 yards (usually at the McDonald's DriveThru). you may have arrived there after a long drive, perhaps with kids. The decision-making process is often protracted. Would it be too much for the bastards to install one customer loo?