Toys are the stuff of life. What's the point of living if you're not having fun?
A lot of "serious" things started out as toys. They just became ubiquitous and expected. The fabric of society becoming the fabric of reality. Especially if you had strong social needs.
Religions for example started out as stories. philosophy itself is considered by some people to be toyish.
Serious things often involve money. That their end use case is to eventually buy some sort of toy is often forgotten. Only with the positive and the negative electrode do Sparks fly.