WordPress is an Open Source Software
WordPress is an Open Source software which means it is free! It can be used on any personal, and/or commercial projects without any restrictions (cost, legal etc).
Why would you want to pay a company, a yearly license fee that does the same job as WordPress with a difficult user interface? Why not just hire one developer if you are willing to spend the cash and pay him/her as you need their service. Many high-end CMS requires “Seat Licenses” which means that you have to pay them per user who will be using it. On the other hand WordPress is free of such restrictions. It does not even require backlinks which many other scripts do. However many supporters like us, link back to show our appreciation.