"Silver and gold may shine more brightly than copper, and are more valuable because of it. But if you gather enough copper together, it's worth just as much as that one gold coin."
Except these aren't copper and Naruto/Sasuke only have one set of eyes each and physically speaking, they don't have the bodies of an Ootsutsuki type shinobi; only the power. If you cut them in half, they die.