I often read that anyone can relieve and the sabermetric community seems to think that you just Need to take a hard throwing SP prospect with fringy control and make him an elite reliever. while SP is of course still more important than RP, the Price of top relievers really has gone through the Roof. The industry thinks that relief pitching is more important than many analysts in the saber community think. even some very sabermetric organisations have paid high prizes.
for half a year cubs gave up a top 30 prospect and a top100 prospect
two top50 prospects
Ken giles (not even that elite, just one really good year):
two top100 Kind of prospects (albeit Appell seems to be a bust)
If you look at WAR vs the Surplus value of the prospects those are terrible deals. even in a fantastic season a top reliever will barely top 2.5 WAR and a top30 prospect might easily offer 50 millions of Surplus value.
however the industry seems to think differently. Are they valueing them differently? or is that purely a sellers market Thing i.e. Teams wanting to get those relievers so that not somebody else gets them and beats you with the reliever?