I strongly disagree. A really good middle reliever is invaluable. Since the Cubs turned the season around, Marmol's stabilization of the middle relief has been a major factor. In this pitch-count and long-count age, it's also not that common to get 7 full innings even when you're winning. Having reliable relievers helps prevent your manager from going Dusty and having Prior pitch 130 pitches rather than take chances with an unreliable bullpen. As good as Marmol has been, his one or two innings of solid relief work can never make or break a game. Relievers are never invaluable. The Cubs turn around had a lot more to do with ARam coming back and Soriano going on a hot streak that Marmol pitching well. As for the pitch count issue, Marmol probably isn't going to save any star arms, no matter how good he is. That little intangible certainly has an affect, but not enough to make it a major selling point. I will agree with other arguments that a consistent, cheap reliever is rare, but while that may increase their trade value, it doesn't increase the amount of wins they contribute to the team. The bottom line is that relievers only get to pitch a limited number of innings, and that means that their value to the team is limited, much less that a starter or everyday position player.