I kept BJ Ryan in a four player keeper league coming into the league..
I'm with the people that say it depends on the number of keepers.. If you have five or less, I'd say its very hard to keep a closer..
I have both Ryan and Palpebon right now... I might have a hard time keeping either one of them with: Howard, Holliday, ARam (given the normal slow start and injury history, might not keep him), Chris Young, Hamels, Liriano?