Cost of existing on the internet
Having a website exist on the internet costs money. Even if you made your own website from scratch and ran it off your own computer in your house you still would have to pay electricity and a domain registry. Most of us can't run websites off of our home computers because we don't have business class internet at home, don't have the skills to manage and maintain it, and don't want our computers running 24/7 sucking up electricity. For this reason, we pay for what's known as Website Hosting.