That's a very simple and damn good question. Why wear a Swiss watch? First of all, if you like watches, you know that a watch is much more than a timepiece. A watch is a useful piece of jewelry. Is something that you inherit or you leave further behind to your dear ones.
Some people do not tend to get fond of quality things. The cheaper, the more, the better; after all, variation is nice. However, if you are like me and like the majority of this board's members, you may tend to become attached to certain things around you. In this case, a watch becomes a sentimental value. And if becomes so, why not have the best one that you can afford?
Plainly, I love mechanical watches. They represent the closest tie of the mankind to the universe. Closer than Apollo 11. Because by making them, the watchmakers are trying to match as close and as accurately as possible the time laws of the universe.
I wear an Omega. I also wear an IWC and a Blancpain. I do like their simple looks, looks that are so unique and different than of a regular watch. I do love what's inside them and I have great respect for the amount of work and thought spent by their manufacturers in providing us with the best they can give. I also take my hat off thinking of the rich history behind them.
I could go on but I don't want to become boring. It all depends of how you look at a watch. What it represents for you.
Good luck.