Word-of-mouth is a powerful thing. You can promote until you turn blue but when it comes down to it, visitors will believe their peers over the business owner.
YouTube allows your video to be exposed to the second largest search engine (Google being the largest). So, it only makes sense to create videos to help viewers find you!
Your own website video is the best way to communicate exactly what you and your business are all about. Imagine giving your potential customers personalised greetings that represent your company and the products or services you offer.