I think the quickest answer is to do what is easiest and cost effective.
Having said that, I think that I wrote quite a bit on reusing the glue, and that the technique was handed down saying that it gets better and better and that new glue was added
mostly to cover any loss to the batch.
I can see were using it over may cause it's "memory" to change, possibly the more it is reused the tighter the initial tendrils at which it begins to pattern become
tighter thus leading to tighter, deeper, and brighter chips. These would silver and leaf up brighter and the deeper curl would reflect light like a dished lens.
I KNOW there must have been some upside to the insistence that the chipping glue preferably be reused. Maybe it was not as plentiful or price friendly in the early period.
Maybe it stemmed from the depression and they never changed the practice. Maybe Julia Child knew the answer

Pat