The real reason Fang Yang could come up with for them saving others was simply because of one thing.
Contribution Points.
With the mining outpost being completely destroyed and overrun. The merit that these inner disciples could gain by achieving a slight victory would be outstanding and could at least accumulate years worth of contribution points, Plus the hidden benefits of saving the lives of these talented inner sect disciples would allow them to form life-saving connections with talent's that all have the potential to breakthrough into the foundation establishment. If the people you saved eventually happened to break through into the Foundation Establishment realm. The benefit was something that couldn't be measured by an amount of spirit stones.