The perfect strategy is to show your client what their benefit and return on investment would be on this specific advertisement. This is what they are looking for from your pitch. It is great if you show them a positive benefit that they will receive from the advertisement. An example would be a return of a certain amount of money that is more then they invested. Sometimes they will have a certain budget that they must spend wisely. You must ask what the client needs for their benefit. It could be an increase towards their image or recognition. After you find out what they need you will be able to sell them the right advertisement.