Fair enough, but that doesn't negate their refusal to sell them for that purpose. They refuse to sell them for that purpose because they know the state will pay far less than they would otherwise lose from public scrutiny. I'm okay with that.
It doesn’t negate it, but it does taint it. You know that if they thought the calculation would come out the other way and they’d make money, they’d be actively soliciting prisons to buy their drugs for executions.
Except this is unlikely to be a big business opportunity, plus chances are someone would notice (executions in the US aren't exactly secret), so I would be pretty surprised if big pharma companies would try to circumvent this.