How much worth did a copper plating provides?
Yes.
Worth regarding what? I mean, it depends on what material.
Anything that isn’t aluminum or steel to a lesser extent won’t cost much at all relatively speaking.
Plating steel with copper is harder to do properly.
Plating aluminum with copper by contrast is very difficult, and requires special expertise, which is why it will cost you quite a bit more to do so.
I got a very thin layer of copper onto some aluminum in last year’s Old Lumens contest.
I can’t really recommend it.