Women "lose their value"

According to the Taliban, "women lose their value if anyone sees their face in public" and this is why they demand that women wear the full on burqa or chaadar covering them from head to toe. According to the Taliban, "A women has her own value and that value decreases when men look at her". I spent several years in Afghanistan since 2001 and many of the women I met were intelligent, elegant and certainly a lot smarter than their male counterparts and their value as persons certainly wasn't diminished by being able to see their faces. I am gay so therefor have no sexual interest in women but I sure prefer to see someone's face when I'm talking to them rather than some cloth sack with a pair of eyes... So by how much is their "value diminished", 10 goats less if a man has seen their face?