Surely the in house movement of a Rolex gives it some higher value than a Tudor of the same era? The case, crown etc were identical on older ones. Tudor had ETA, which granted were fettled in house, compared to the complete design in house of the Rolex.
Wasn't the point of Tudor to provide the benefits of a reliability and quality to the everyman/woman? That is certainly what research has told me.
Likely it's a brand tax though. VW and Porsche both made engines which were identical, the type IV, but because its got six letters stamped on the outside, the (percieved) value is much higher than the VW equivalent.
For me the Tudor brand makes more sense; things must function in life. If it stays in a safe or drawer it's not functioning and may as well just be a pile of cash (unless it's an investment, which is a different kettle of fish)