My generalized opinion of a lot of companies is that they have their own internal agenda and publicity programs already set firmly in place when they begin to woo buyers and do not really want to deviate from their script by answering a lot of impromptu questions. They would rather point out that they have brochures and such to answer your concerns.
From the reported aloofness indicated by roibeard, I would say Plug Power fits my opinion fairly well.