Common statin's (for lowering cholesterol) can cost more than $700 for a 30-day prescription if you don't have insurance. I think the cost issue goes well beyond prescription drugs for rare diseases, and in fact, is more detrimental in a broader sense.
But, when we as citizens don't insist our politicians address campaign finance reform, policies favoring corporations will continue to guarantee price gouging will continue. Campaign finance reform should be made the top issue... Every. Single. Election.