I study knife, stick and flexible weapons because they are practical. I study Rokushakubo because it is traditional, practical and the favorite of my Sensei.
If you have to ask that, you have never hit someone over the head with stick
I familiarise myself with stick work because in my job, my 'weapon of opertunity' is the maglight I carry, and i prefer to know how to use it in that way.
I study Kobujitsu for several reasons. The first being that I simply love it. It also never ceases to amaze me as to how much it benefits my Karate training. The two arts truly do go hand in hand. Weapons training helps me strengthen muscles that I would not normally use in Karate. The theories behind weapons katas are just as deep as empty handed katas and I love studying their applications. And like everyone else, I enjoy being able to regard everything as a weapon. No I do not study weapons because I think some day I will be walking down the street and Ill be attacked when I have my sai. Weapons study, like any martial art is also about preservation of the art itself. Yes alot of the weapons are archaeic to a certain extent. But if we discontinued our studies of them, their tradtions would be lost in time.