When summoning the various affiliated forces, not only must a spiritual object be paid at the outset, but should they suffer significant casualties and losses, certain compensation must also be provided. This is not a cost-effective approach for the Cave Abyss Sect.
It cannot possibly be like the previous grand battle between the two camps where the affiliated forces were simply dismissed with a few promises, could it?!
If the Cave Abyss Sect were to do so, it would truly lead to a disheartened populace. Not to mention that in the future no power may be willing to ally with them, but it's also possible that the existing affiliates might consider defection.
"Indeed, summoning the affiliated forces is not cost-effective, we might as well let those Loose Cultivators exert more effort; at most, we would only need to give out one spiritual object."