Templates save you money: If you use a royalty_free template, it likely costs less than hiring someone to create a custom graphics package for you. You could easily spend hundreds (or possibly thousands) of pounds on a custom motion graphics opening, for example, whereas you can frequently purchase a royalty_free template for under £200. Of course, the royalty_free template isn't as unique as a totally custom template, but it definitely costs less, and you could always customize the royalty_free template to make it more unique for you.
There are so many templates. You can write a simple letter. Or make a proposal for your work. The graphics are great and so easy to insert. With options like text boxes and the ability to add photos, everyone can turn out professional looking documents using Microsoft Word templates.