It is NOT dumb. But if it is, then I am dumb too. I have a gold birkin bag and a gold kelly bag. Gold is a neutral staple color, like black or dark brown. I think you could have each bag (a birkin bag, a bolide bag, and a kelly bag) in gold, black, and dark brown and it would not be redundancy. (Assuming you had around $60K to throw at the situation, that is)
If I could only have one birkin, I would opt for gold. It has always been my favorite bag, and if I could only keep one bag, that would be it. I hope this helps.