Actually a lot of people need them. They increase efficiency if you have a job or business. Take something simple like checking in for you flight the day before. You can be anywhere on the road with a smart phone, check-in and get a pretty good set. A lot cheaper than flying business class.
Add stock transactions to that. Can't easily buy or sell when you're away from the computer without a smart phone. Unless of course you place a call and pay extra for broker assistance.