The Three Saints Sanctuary's disciple recruitment ceremony is basically held once every two years, which is not a very frequent occurrence; some sects in the Nine Provinces even take in a batch of disciples every year.
Because the mortality rate among cultivators at the Spirit Stream Realm is very high, even if one survives the Spirit Stream Realm, there are no guarantees of safety when reaching the Cloud River, True Lake Realm, and even the Divine Sea Realm.
The constant confrontation between the two main factions means that the Nine Provinces are destined to experience unending strife.
To ensure that a sect has sufficient heritage to continue its legacy, it must constantly absorb new blood.
Generally speaking, the recruitment ceremonies of sects of the 2nd and 3rd grade not only involve themselves but also concern nearby sects of slightly lower grades.