Imagine you want some freshly pressed orange juice. At the beginning you can easily squeeze half an orange and a lot if juice will come out. But the more juice you squeeze out of the orange the harder it gets to get more juice.
At a certain point you would have to use to much force to squeeze out the remaining juice so you just dump the orange and get a new one.
So at certain point the work to get what you want far exceeds the resulting benefit. At that point it is waste
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