Should I rely this heavily on pitching?

[illiniprd]

I'm in a 12 team head to head points league, and it seems that the good teams in the league have starting pitchers for their entire bench. I've followed their lead, and am in first place so far. Is this going to bite me in the second half? Please let me know.

Starters:
AJ Pierzynski, Todd Helton, Alfonso Soriano, Michael Young, Eric Chavez, Jason Bay, Reggie Sanders, Gary Sheffield, Cliff Floyd

Relievers:
AJ Burnett, Brian Fuentes, Mariano Rivera, BJ Ryan, Jason Isringhausen, Scot Shields

Starting pitchers and bench:
Kevin Millwood, Matt Morris, Carl Pavano, Sidney Ponson, Josh Towers, Jon Lieber, Jason Marquis, Andy Pettitte, Mark Prior, Ervin Santana.

DL: Orlando Hernandez