Simple version~ I'll write a detailed one when I have the chance.
First, these ancient tea trees grow in deep mountains at high altitudes. There might have been ancient tea trees near low-altitude cities before, but they were cut down during development. These ancient tea trees in the deep mountains are gifts of nature; only with good ecology can good tea be produced.
Second, these trees are large with deep roots and lush leaves, so the quality of the tea is much better than that from small tea trees in the same area. That's the second reason.
Third, rarity makes things valuable. If there were only one grain of sand in the world, it would be more precious than gems. Many people hear that ancient tea tree tea is good and chase after it, but the quantity is small, so it becomes more and more expensive.
I'll write a long article to elaborate when I have the chance.
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