Clients come to listed restaurants and they bring their friends. It brings in a lot of business. If a restaurant fails to offer the discount, then Debbie will check it out and try to ensure the client is recompensed. It sometimes happens that a waiter will be new and may not have heard about the discount. In that case, I'll call the restaurant and see that something is done about it.
Clients are often so pleased that they e-mail with enthusiastic comments.
The decision not to charge restaurants for a listing on the site was deliberate. My aim was to provide the best possible content. If you want the best content, then you can't limit the restaurants to advertisers. You need a big client base to attract other kinds of advertising. I estimate that we need a client base of 5,000 to expand our advertising.