Agencies charge a significant amount of money up front, and you don’t see the outcome until after the work is done.
At the end of the day, if you don’t have actual sales that means your advertising and marketing campaign isn’t actually working. You prove your value to your clients is the impact you can have on their bottom line.
In Ogilvy on Advertising, David Ogilvy talks about tracking award winning agencies and the clients whose campaigns won the awards. In most cases, the award winners didn’t retain their clients, because those campaigns were focused on winning trophies, not selling product. In other words, those awards didn’t translate into sales, and therefore don’t provide us with a way to prove value.
So…what else is there??