Great question! I have a few answers...
1. Your video ad meets your customers right when (and where) they are searching for you - on Google, Yahoo, MSN and AOL search engines! (It is clear now that Yellow Pages use is declining dramatically)
2. Your video is a warm and friendly way for the person looking for a prospective customer to "get to know you" and your business BEFORE calling you or coming to visit your business! They will be pre-sold on your products and services.