What are the difficulties in attempting to cheaply mass-produce graphene?

I've heard of graphene being touted by engineers, physicists, and nano-tech guys as being the new miracle material- six times lighter than steel, but ten times stronger, funky electromagnetic properties, greater quantum efficiency than silicon, and probably more I've never heard of.

I'd like to know why we, as humans, can't easily and cheaply pump out graphene. What obstacles are present and what obstacles have already been hurdled, and how were they hurdled?