Money? These drugs and the companies don&#x27;t come cheap.<p>Take Gilead for example, which created Harvoni&#x2F;Sovaldi for treating Hep-C. It&#x27;s currently valued at about $150B. Before the release, it was a quarter of the price, so the value of Gilead&#x27;s Hep-C franchise is in the order of $70-$80B at the very least. That&#x27;s about the entire net worth of Bill Gates.