Relief Pitchers .............
First off, I will say that I also think 'saves' and especially 'holds' are a useless stat. However, I am one who believes that a strong bullpen, including your closer (of course) is every bit as valuable to your team as your five man rotation. Face it, pitchers are no longer conditioned to pitch nine inning games. 100 is now the magic number for teams when it comes to pitch count. Reach it and your day is over. Many organizations (maybe they all do now, some didn't before) have structured pitch count limits for their minor league pitchers - low at first and gradually increasing. Teams will also limit the number of innings their young pitchers throw in a season and being close to the Red Sox, I know how they have shut down pitchers in September as opposed to adding them to their expanded September roster. Clay Buchholz being an example two years in a row. Teams now invest a huge amount of money in their starting pitchers (see CC, AJ, Johan for examples) so they are not about to over work them. Dice-K has been shut down due to a 'tired shoulder' from over work in spring for the WBC. There are very few Doc Halladay's around anymore who get you nine or very close to it nearly every night.
Having said that, good relief pitchers are vital to a teams' success. Without them, your team has very little chance of playing any meaningful games in September. Yes a closer may only be asked to get three outs to close out a game, but he has to do it as many as 40-50 times or so a season, some even more. It is not always as easy as one-two-three when he is often facing a succession of very good MLB hitters. Facing a trio of say, Jeter (when he batted second), Arod and Teixeira on a Sunday night, then the next night the old Red Sox combo of Pedroia-Papi-Manny with the game on the line, is no walk in the park. If you 'save' the game, everybody goes home happy, very little is said, but if you lose - it is your fault, you blew it. Just read the recent comments on here about BJ Ryan, some want to run him out of town.
I am wondering if Toke would change his tune if Rivera all of a sudden lost it for several weeks, gave up a ton of wins and fell into the basement a dozen or so games behind the leaders. Yankee fans would be outraged. Just as Jays fans have been all over BJ, I know Red Sox fans (me included) would be lining up to drive Papelbon to the bus station. Just think back to 2007 and Eric Gagne and you will see what it means to have an effective closer.
Simply getting three outs in a close game is not as easy as it seems to some people. If it was, you wouldn't need a designated closer, you could pick a number and anybody could come in a close out a game. It takes a special type of player to be able to handle the role. These guys are specialists, they come in with the weight of the team and 40-50,000 screaming fans on their shoulders and are expected to be perfect every time. How many people are perfect every time they do something? Are they all worth K-Rod money? Is anyone worth CC money or Teixeira money? It is a tough job that not everyone can handle. As a fan of one team, I know how much I appreciate them.