Perhaps to you, but they don't approach the speed and accuracy of even the cheapest gaming mouse.
That is, in fact, a lie. Granted, it's at the low end of the resolution of gaming mice, but since you can move the ball more than a mouse ball without having to move your hand, you actually end up getting more precision. The sample rate and the DPI are both fine for gaming.
Do you know how to use a mouse?
Do you know how not to be a condescending dickass? Wait, no. You don't. I must be new here. Cowards like you never know that.
You're not supposed to be moving your arm, just your fingers.
If you're not moving your arm, then you're moving your wrist. If you are moving your arm, you're moving your arm and your wrist. I don't have to move my wrist to use my trackball. If you don't know you're moving your wrist when you're moving your mouse, then you're not at all in touch with your body. It's the smallest repeated movements that do the most damage. Kind of like when you masturbate.