"I think it is important to study the cost-per-click metrics in detail. Identify the trends and the time of day you are yielding results, and target those audiences. Never wholly trust an online advertiser. They'll never live up to their claims. There is no blanket approach, one-size-fits-all. Do the legwork to come up with a customized approach. Then you can employ more agencies and audiences, only advertising to certain demographics at certain times of the day. Never sign on with big packages. Get the highest yield by putting in the time to study the metrics and identify the opportunities that are visibly there."