Just because Awakeners earn a lot, doesn't mean they don't also spend a TMD lot.
Ye Nai was no longer concerned about how to replenish her superpower if it ran out, as long as this remained a carbon-based world with organic matter, her fungus would continuously provide her with energy.
As for whether it would be needed in the future, that was a problem for the future.
So her desire for Heart Cores was genuine, wanting them as collectibles, curious to see how many she could accumulate in her lifetime.
After sleeping in the living room for so many years, all her possessions could fit into a few boxes, as if she had no desire for material things, but the moment she got some space, the urge to hoard arose, wishing to collect things, a drive that was completely instinctual and came from within, with no one teaching her.
The convoy had been on the move for most of the day and reached the second frontline camp before dark.