The title is important, it should contain as many keywords as possible.
2nd secret: The pictures. A watch with brilliant pictures will get you 3 times the price than one photographed with your daughters Barbie cam.
The rest is always the same: You dont need one fool, you need at least 2 of them.
Omega are indeed good for trading, I once bought a nice constellation for 200 Euro and sold for 780 Euro.