As a manager of a (large) store, let me weigh in here. (Let me just say that in my store, we have a scanner system PLUS each and every item has a price sticker.)
DaMoshe is CORRECT! Kvetching and complaining will not work most of the time. By causing the manager to have one of his employees dedicated to do a ridiculous, unnecessary, and preventable job, i.e. putting back all the more expensive brands that you brought up to the register, he will think of ways for this NOT to happen & then conclude that it’s worth it to make the prices clear. In the long run, it’s not only the prices that bring people in, it’s the pleasant shopping experience. Not having prices displayed makes for a rather unpleasant shopping experience.