Let's look at the opposite benefit to a store if a mom that would need to bring her 3 kids to the store vs that mom having a personal shopper. In this case, the personal shopper is "better" for the store as far as physical space. However, I'm sure the store would still rather have the mom and 3 kids physically in the store so that the kids can nag mom into buying unneeded items that are placed specifically to attract those kids' attention.