Thats because Starbucks WiFi is now free. I am talking about the other ATT WiFi hotspots like at airports. I travel a lot, don't like Starbucks coffee, and sometimes need/want a faster connection than my 3G.
When I can find a Sky Club at the airport I am good but lets say I am at the Sheraton Los Angeles Dowtown. Hotels like that charge between 10 and 15 bucks a day for internet access. If I can get free ATT WiFi, I save my company or myself money.