Well that's the question in the investigation, isn't it? In the videos, they are haggling over the price. If they were simply going to sell it for cost, they'd just sell it for cost. The videos would be much shorter in that case. Also in the videos, they talk about changing the way they perform the abortions in order to preserve certain organs, including the brain. (In one, one of the PP people says that "Everybody wants livers.") In another, one of the VPs says that they've given the power to negotiate prices to their affiliates on advice of their lawyers, in order to keep the national group's hands clean.
And let me also say, what they were doing may be legal, may not. Frankly, I think we get too hung up on that question. What they are doing is disgusting, immoral, and a national shame. How anyone can watch the videos and come away with any other conclusion is beyond me.