You are right. That is the reason why it's done this way. TV advertising is about hammering a memory into your brain through repetition. A significant portion

You are right. That is the reason why it's done this way. TV advertising is about hammering a memory into your brain through repetition. A significant portion of their audience does exactly what you say (go to the fridge or bathroom). Making the ads as loud as possible helps to compensate for some of that. The general idea is that next time you're in the shop and forced to choose between 30 detergent brands you will intuitively pick the one brand that you've at least heard of.