Why there is so little qiviut
One moult a year, a small population, and a cleaning process that removes most of the weight. The arithmetic of a rare fibre.
Every rare material has a reason. With qiviut the reason is simple enough to write in a paragraph.
The musk ox sheds its underwool once a year, in spring. There is no second harvest. The animals live only in the Arctic, in limited numbers, and most of them are not in reach of anyone collecting fibre.
Then the fibre gets smaller
What is collected is not yet usable. Raw qiviut comes away mixed with the long guard hair of the outer coat, with dust, plant matter and snow.
De-hairing removes the guard hair. It is slow, and it takes away a significant part of the weight. What remains is the fibre that makes the yarn.
Then it has to be knitted
Most finished qiviut is knitted by hand. A fine lace shawl is weeks of work for one person.
So the supply is limited three times over: by the animal, by the cleaning, and by the hands. This is why a qiviut scarf costs what it costs, and why a cheap one deserves a question.