High end fragrances tend to be a bit longer lasting, though all aftershaves "go off" after some time, from experience usually a year or two when only half the bottle may actually have been used.
This is a fairly pointless discussion on any forum though as you will never actually know whether the "you smell nice" comments posted by others come from someone you, individually, would care to receive a compliment from. It could just have been Donna the **** from the Fox and Hound.
There is also the "feeling" of wearing something nice and "luxury" that you might experience from wearing a high end fragrance. Many people here would balk at the very suggestion of this as they will immediately pounce on this idea and call it vain.
Whatever you do, don't **** Lynx off though, because some users here get very upset.