Then again, what is your actual return on "investment"? Say you buy a popular stainless steel model, such as the Submariner, at USD8,000. But before that, you had to buy 3-4 pieces of Rolex in precious metals, making your outlay at 4 x USD10,000 plus USD 8K, USD48,000. When you eventually sell the Submariner at USD10,000, did you really make a 20% ROI? Other issues that will eat away your ROI are servicing costs, seller's commissioning, import/export taxes, etc.
Moral of the story, you want a good investment, buy stocks. If you want people to know you have plenty of money on your wrist, buy a luxury watch.