Why, when there are clocks everywhere and most people carry cell phones with a time display, wear a luxury watch?
It's not for the watch, but for the luxury. To feel good, you must look good -- not necessarily in terms of physical features, but by being well put-together. Every girl's crazy about a sharp-dressed man, or whatever it is you are and are interested in, and part of dressing sharp is proper accessorizing. A luxury watch is part of that.
That's because a watch is part of the first impression you make. People draw conclusions about you from your appearance before you've said a word to them. A nice watch helps that impression. It's a sign of success, and it's a sign you're making an effort.
It's important to your soul to be able to indulge in occasional luxuries. A watch is a good choice because it's easily recognized as a luxury without being flashy, and it's useful as well as aesthetically pleasing. A luxury watch is one of the best investments in your look that you can make.