Whether it is an online business or a brick or mortar store, it is possible to use youtube to get more sales. For those who already have a blog and have seen it drive your sales up you can use what you already have to get even more sales because youtube users may not even know your blog exists.
How to do it?
It's rather simple. Re-purpose all articles that are of informative nature into tutorials of sorts. Many people would rather watch a video showing them how something is done rather than read about how it is done.
Now promote your youtube channel all over the net, and as your audience grows, you'll start asking people to visit your blog for more information about something - anything relevant will do - and once they land there, get them to buy something!