There is no point of taking these metaphors too far or too seriously. The idea of painkillers vs. vitamins is a must have vs. nice to have. Call it painkiller,

There is no point of taking these metaphors too far or too seriously. The idea of painkillers vs. vitamins is a must have vs. nice to have. Call it painkiller, antidepressant or get-out-of-jail ticket the concept is the same. My favorite metaphor is whether my product is an offer my target customer cannot refuse. For whatever reason.