If wireless Internet access is such a hot technology, why is it such a dud business? Wi-Fi hardware, which uses radio signals instead of cables to connect computers to the Net, is already in more than 10 million laptops. But try to make a buck selling connectivity. Starbucks charges up to $6 an hour for in-store T-Mobile access - not much more than a double venti Frappuccino with a raspberry shot. Though its wildly successful overpricing works for coffee, it's failing with Wi-Fi. Demand for the service averages fewer than two customers a day per store.
