I have a plate that is probably only worth scrap value of the tin, but to me, i reckon its worth alot.
Its not even a 'combination' just a random standard issue.
Its an old Californian plate, still with early 80's tags on it, its in average condition, but it'll look awesome hanging on my wall of my garage once i get around to setting it up how i want it (and buying the house attached to it, but thats another story)
It came into the country attached to a Fiberfab Avenger that was planned to be restored, but changed hands several times before i ended up storing it for a mate.
As was said though, anything is only worth what someone is willing to pay.