That hasn't stopped them before -- they cast people who were bit players on sitcomes and the guy who showed his dick for 5 seconds in the Sex and the City movie. Also guys who danced in the 2nd row in boy bands and never got a solo contract.
It must be something else. Maybe he made a bunch of demands or something. Or maybe he's just socially inept. BUT AGAIN that hasn't stopped them from casting Andy Dick.