A RP getting shelled once or maybe twice in a season isn't going to kill youer ERA, but when it happnes 4-6 times, it can affect your standings greatly.
5 runs in an inning I believe would raise the ERA in a season by .04 (assuming 1250 IP and an ERA of 3.5). If it happens 5 times, your ERA goes from 3.5 to 3.7. That gets to be a problem. When some teams put 2-3 questionable closers (Politte, Jiminez, Mesa) out there, you almost assure yourself of being mid-pack in ERA at best.
Anybody use 2 of these guys (or similar) and in the top 3 in ERA?
* Steroid induced record