Of course, this markup was necessary because there were countless disciples of the sect and countless wars going on around the huge Tian Ming Continent at all times. Using Li Ling as an example, if he did not give Pang Wen 80% of those spoils, he would have earned slightly over a million low-grade spirit stones, able to go on a brutal second-realm-level shopping spree.
However, it should be made obvious that the things that could be purchased from this branch store were limited to equipment, resources, and items. One could not purchase sect-related techniques from the Six Paths Pavilion with spirit stones, only merits, which was the rule throughout the Six Paths Demon Sect.
