Actually, some people are quite happy with copper. I don't recommend it, because I can't ID who will be.

BUT, if
a) you have a dark haired family, and
b) a patterned liner, and
c) are not to picky about variations in the pattern (stains), and
d) avoid shocking (spiking chlorine levels) and thus manage to avoid black copper oxide stains,

THEN, you may be quite happy with copper.

But, the view from here isn't sharp enough for us to pick out who those people will be, especially since they are a distinct minority.