I know some people that can't use mice without pain. Hence they are trackpoint all the way. I only use the trackpoint on my laptop as well, but I'd rather have my logitech mouse with 'tilt' style wheel.
One of my coworkers has this issue. He brought in a trackball for that reason. Makes sense the trackpoint would be the ideal mouse in a laptop for that reason. No need to move your hands off the home row.