New stuff on the other hand - sure, it's new, but unless it's not mass manufactured, I'm willing to bet it will not last that long. Especially if it's something you would wear fairly frequently. Also, everyone else has one! Unless you purchase something unique from a high-end boutique (which the masses usually can't afford) you'll have something that most probably half the population have or want also.
My argument is that vintage is unique, interesting, inexpensive most of the time and it's already lasted 40 or so years so it's already proven it's worth!
Again, 80's does not qualify as vintage with me. Just to make my point -