Buehrle is an elite home field pitcher (Top 25). It's frustrating that you can't, as an owner, start him on the road, but at least you can bank on an overall excellent season if you limit him that way-- he's still very productive. In fact, he's basically Roy Oswalt at home-- and who wouldn't want to own Roy Oswalt?
Many pitchers don't have such defined splits, so be thankful that he doesn't suck everywhere. Bronson Arroyo is having an All Star season because of his home starts. Dave Bush has made owners not feel so bad about drafting him since they know they can rely on him at home.
EDIT: Another one I found is Doug Davis. His split is ridiculous-- a total Jekyll and Hyde. In fact, you can probably steal him from an owner for a bag of balls and start him at home only and get a truly excellent pitcher.
Chris Iannetta was born on Krypton and transported to Earth as an infant and saves the universe when he's not getting on base every plate appearance.