But it doesn't really matter what you do. What matters is if it makes the company money, usually meaning what a sizable number of other people do. Even if you spend less, if 5 other people spend more, that's why companies would want to do it.

I don't think this is the only reason though. I think it's also to keep the store feeling like a new store. They want shoppers to feel like they're getting new experiences every now and then. They don't want to be stale. It's like how many people rearrange their furniture every few years. Change gives feelings of novelty. Sure, you could buy a new couch, but just changing which walk the couch is against is a cheaper alternative.