Practice makes perfect, so they say. In general, that's true; at the very least, it's difficult to become worse with repeated practice.
I work hard, and train everyday. My skill of choice? Lying.
Now, the problem is that you can't simply lie alone. Lying to a wall, or to an inanimate object, isn't lying- that's called neurosis. You need someone else to lie to.
Practice makes perfect; so my lies became better and harder to detect. The downer? Practice makes perfect; everyone got better at seeing through my lies.
All in all, I think I lost more through practice than if I had just slept everyday.