MetroFi needs to draw enough ads to make service add profits

"There is no proven Wi-Fi model yet, but we believe free is the best. Everyone loves free. You don't have to pull out your credit card if you just want to use your laptop,' said Chuck Haas in the San Francisco Chronicle's profile of MetroFi. 'If you're on for an hour at Starbucks, our incremental cost is zero. We may have made only a dime or a quarter off of you, but do that many times and you can see that's a good business model."