You can also find website templates that are designed for content management. This means if your goal is to create a content-based website, such as a blog, you will have an easy time managing the content. You will be able to easily create and publish unlimited blog posts, and all without having to have knowledge of web programming like HTML, CSS, PHP, etc. One of the best templates for content management would be WordPress and also Joomla. There are other options available as well that you might be more comfortable with.
The first reason would be because hiring a web developer or designer is going to consume far more time than getting website templates. Think about it, you have to explain to the web developer exactly what you want. You have to go over it with them again and again and again. You will have to monitor what is being created and make adjustments during the project. Once the project is finished it is probably going to be behind schedule, and adjustments will need to be made that might cost you more money and more time.