delayed reply, sorry
Drugs that CURE are not profitable.
Big Pharma loves drugs that TREAT and require expensive daily doses for a lifetime.
Big Pharma loves patented formulations to protect their profit margin.
Big Pharma loves to come out with "blockbuster" drugs frequently because these bump their stock price as speculators buy in. The new drugs are under patent protection for a period of time whereas old drugs are less profitable because off-patent and generic competitors can be made.