In the old days people would always hire a professional website designer because they felt this was the best way to ensure they got a professional looking website made. Companies and individuals were willing to spend thousands of dollars for the chance to create a web presence that would give them a good image. Nowadays, especially because of the state of the economy, many companies and individuals are deciding to go with website templates instead of a website designer or developer. There are a multitude of reasons for this.
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.