1. Rare material: Monkey Head String Jubilee is a kind of precious fruit material, which usually grows in the sparsely populated places in the mountains, and it is not easy to pick. And this material has a small production, so it is relatively rare.

2. Handmade: The production of Monkey Head String Jubilee requires a number of handmade processes, most of which need to be done by hand, so the production cost is relatively high.

3. Fine craftsmanship: the processing of Monkey Head String Jubilee is very fine, requiring high skill and experience, so the quality of the strings produced is high.

4. Collector's value: due to the above reasons, Monkey Head String Jubilee has a high collector's value and has become the object of many collectors' pursuit.

Consolidating the above factors, we can see that the reason why the monkey head string jubilee is expensive is mainly due to its rarity, handmade, fine craftsmanship, and collector's value and other factors.