In case this needs to be said: the first thing you have to note is the difference between a player rankings list like this and our projections. The first is a subjective list of players presented in the order of where the Yahoo! experts think they should be drafted. Our projections, on the other hand, are an objective list of expected statistical impact, based strictly on z-scores.
If you are just asking about the math itself: most of the middle relievers get their value through low ERA and WHIP, and in some cases it is truly significant. Most of the time you lose W, SV, and K in the exchange, but when a MR throws sky-high K/9 on top of great ratios, he can be a very useful player. I'll be the last person to tell you to draft/buy Jansen in the top 100, but I'll be the first to point out how sneaky-good of an impact a player like Jansen can make on a team. He finished last season 54th overall (20th pitcher) and he's currently projected as 98th overall (36th pitcher).
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