The key to this whole argument is PREDICTABILITY
you can predict the exact players that will acquire 90% of the saves on any given week.
Wins are VERY hard to predict
Steals somewhat so but you can always trade for a sanchez, castillo, pierre and get what you need. It's a category that's so concentrated in just a few players.
The key to Fantasy Sports is NOT about Sports but rather the "manipulation of numbers" in your favor
MASTER THOSE NUMBERS