Collecting, re-enacting, etc. The same reasons people want things such as old Enfields, bayonets, and similar. Not necessarily as an actual weapon but for it's nostalgic value of another age (or even another culture in this case)
No real use; just an indulgence in a bit of fantasy. Unless you're training in Martial Arts, in which case training with weapons is mandatory at the upper ranks. And even then it's still more fantasy than expecting to ever use them as actual weapons (no tournaments I know of have weapons combat and edged weapons are impractical for real defence)