When your team is hitting .230 heading into games, you really can't pick or choose when a power threat like WMP is made available. Again, this is all speculation but it seems like WMP would be a likely trading candidate because I don't feel he's gonna get the playing time in Boston.
Another thing, too, is that Beane does not simply look for OBP guys just because Moneyball said he did. He looks for traits in players that other GMs around the league aren't. There was some discussion where he said he was looking towards good defensive outfielders with some speed, which explained the signing of Mark Kotsay. OBP is not his be-all and end-all.