It is part of the perceived importance. My wife's an (western :) ) artist and I have spend uncountable hours discussing exactly this subject with her and her artists friends.

Even if you could not see / proof the one picture being the real one, their believe is rock solid that the original has higher (emotional) value.

The idea that the original hand, in the original moment, with the original intentions made one object and the not the other, is of paramount importance.

YMMV.