Why? Well, there are a number of answers to that question, but one of the most obvious is that the video will reside in it's own location on the web, which will be designed with relevant keywords and phrases to give web surfers more ways to find you. Then, they can also find the page which contains the embedded code for the video giving you even more exposure (and more keyword and search phrase options) and a higher likelihood you'll be found.
Oh, and there are more reasons, but for a very tiny investment why don't you just do it and see the results a quality animated whiteboard video can bring? Go on. We're really fun to work with. gary@metroweblinks.com