I actually do this, more or less, and consider it rational. For a large number of household goods, I really don't care about them past some baseline quality threshold. So if something worked last time and the price doesn't seem out of line, I'll use that. I generally don't remember brand names for most of these things, but generally can pick out what packaging looks like. And I'm sure advertising influences my first-choice and whatnot on the margin.

I'm sure paying attention would save some money, or, who knows, I might even be "delighted" by a "new" "product experience", but I'd rather just not think about it.