Do you get your money worth from a $60+ 4oz bottle of perfume?

How long does a 4oz bottle of perfume last under regular use? Over the holidays I was shopping with a friend and he was looking over perfumes and it seem every one and his uncle has a sent out, the usual YSL, Gucci, Sean John, Liz Claybourn, those no talent personalities with a family name, etc. The not so well known brands were selling at least in the store we were in at around $60 to $80 a 4oz bottle. I don’t know the chemistry of how difficult it is to make a scent but is the price worth it? Do you get your money worth out of a 4oz bottle of perfume if it cost $60 and often more?