The whole purpose of producing a demo CD or DVD is for the opportunity to actually talk to a prospective customer. Any introduction any opportunity to connect directly with the customer preferably face-to-face is your best opportunity of closing the sale or getting the booking .Don't believe the hype. YouTube Twitter and Facebook are just electronic posters/ windows into what you do but not who you are . People buy into people .People will connect with you and your service if they feel there can be a good relationship even more so than whether your service is more expensive or not as good as the next guy .. It's that personal connection that will distinguish you from the other guy .