Buy a set of snap caps the next time that you make an ammo purchase. They last very well in general (I've used Azoom and Tipton).
At first I used them to practice just trigger control and various grips (right 2handed, left 2 handed, left and right one-handed). Now I use them to practice while watching soccer games, trying to hit the ball. It's good practice to follow moving targets and work on your trigger control--when the angle changes from remote to close up, you lose the ball and have to re-acquire. I dunno, it seems like good practice to me.
I haven't tried watching Netflix with them to help out my heroes yet.