The obligatory supplications of the path are only granted to those who commit to them for life, making them obligatory like other vowed acts of worship.
These practices are made accessible, particularly since they are conditioned on the absence of any valid excuse.
If the seeker chooses to abandon the path, their connection with the Shaykh is severed, and they incur a sin for failing to fulfill the vow, as it is obligatory.
This differs from the supplications of other paths, which are not vowed, and for which one is not held accountable if abandoned.
The wisdom behind vowing the supplications (wird) is that one is granted the reward of an obligatory act of worship. Many saints sought to increase their reward through this practice. Among them is Imam al-Busiri, may Allah be pleased with him, who said:
I have not gathered provisions of voluntary prayers before death,
or prayed and fasted beyond what is obligatory.
(Imam al-Busiri, qasidah burdah, couplet 28)
It has been said: Voluntary acts of worship were vowed to attain the reward of obligatory acts, thereby multiplying the reward. Some adherents of the Tariqa have remarked: One of the reasons for the elevation of our path is that our deeds are rewarded as if they were obligatory, while others receive only the reward of voluntary acts.
(From Qasd al Sabil by Sayyidi Muhammad al Hafiz)