I can pretty much guarantee that if you mentioned WARP or other sabermetric statistics to an actual baseball player he'd look at you like you were speaking a different language. When I played, I didn't care about my stats that much. In fact, I wasn't even aware of them most of the time. In college the only times I ever saw my stats were if I was reading an article about one of the games or if I looked up at the scoreboard during one of the games...although I was normally so "in the moment" at the plate that I didn't pay attention to the scoreboard. I learned early on that stat-watching is distracting as a player, and distractions are never ever a good thing in sports, especially in baseball where concentration is key. The only stat that mattered was WINS. So GMs and players need to know different things?