looks don't matter...(and to some degree that somethings (and people) are fungible)

what matters are more substantial things..

i've heard it used about un attractive spouses.. who are valued for their wit, or wisdom, or character.. even if they are short on looks.. (what, someone said it about moi? yes!)

why keep a cat? if you want a mouser, do you care what it looks like? at night, when the cat is hard at work, its will be grey...