Why do we buy toys?

so i have decided that kids can find the simplest things to play with and be happy. For example a cardboard box, in this case a strainer, Why then do we buy all these toys? Who knows. anyways Kolbie found the strainer in the cupbaord and decided it was going to be his hat. He had his "hat" on for over an hour before he found something else to play with. It was halirious to hear him tell the kids it was his hat and don't touch it.