Not enough volume and markets, I think. Expensive watches and art definitely are. You give someone $50,000 Swiss watch. When they are in Geneva, they resell

Not enough volume and markets, I think. Expensive watches and art definitely are. You give someone $50,000 Swiss watch. When they are in Geneva, they resell the watch for a good price for a reputable Swiss merchant, take the money and walk across the street to the Swiss bank. The same shop can resell the same watch again and again.