The next $0.05 billion that goes to testing and verifying that the manufacturing process is safe, effective and has good dosing regularity is the least part of the expense. You're proposing to let a second company who knows the answers duplicate only the last small bit of expense. Even including human trials the second company would have at least a 90% cost advantage they'd use to undercut the inventor.
Hell, this is the US. The CEO of the first company would form his own start-up, PillagerCo and feed it the winners with insider info to make sure his personal company most successfully raids the company he's CEO of. He wouldn't need to launder that behavior through an intermediary or two as they do now.