Assuming I am so rich and I want to buy a watch, what is your advice?

To spend RM15,000 on a designer watch ie Gucci/Cartier/Chanel or watches made from a watch maker company ie Tag/Ebel? AND WHY?
Thks for all the thoughtful answers. Now I understand why people would spend that much to buy a real good watch. (wow, now I need to strike lottery)
But why some of you jumped to [...]