Coz there is demand for Rolex. And I believe the demand largely comes from the people who bought them for the reason - retaining high value. Its a cycle. Dats only my opinion
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Yeah, you are right, it is the Demand.
Brand (of new category) starts from Demand in the very beginning.
The Demand of Wrist Watch is where Rolex begins;
The Demand of Water Resistance Case is where Oyster begins;
The Demand of Self-winding Movement is where Perpetual begins;
The Demand of Quality Assurance of Watch is where "superlative chronometer officially certified" begins;
The Demand of Date function is where Date Just begins;
The Demand of knowing the Day of the Week is where Day Date begins;
The Demand of Diving is where Submariner begins;
The Demand of Racing is where Daytona begins;
The Demand of Traveling across Time Zones is where GMT Master begins.
Last but not least, the Demand for recognition of owning a Rolex Oyster Perpetual superlative chronometer officially certified watch is what people wants.
Whenever a Demand is high, the value of the Brand to serve the Demand will be high.