Most students who could enroll in such an academy came from extraordinary families. Even if their families were ordinary or poor, those who could be specially recruited were all extremely talented. Therefore, both the former and the latter could search for the vast amount of resources required by their immortal realm's ancestor's decree.
Those resources weren't considered rare treasures, but the amount required this time was too large. Therefore, it was impossible to gather enough resources in a short period by relying on the disciples of the various sects.
In the mortal world of "beyond the heavens," the academy was a place where ordinary people, as well as the children of nobles, could come into contact with cultivation. As for the sects, they were all high and mighty, looking down on many other academies.
It was because those who could form a sect had their ancestors ascend to the immortal realm without exception!