I'm just curious with some high rank who uses copper membership cause based on the description of it.
Why not? If you've paid for it then you might as well use it. Some people like to show that they've purchased it, which is often one of the reasons they donate in the first place.
Well, I'm a bit jealous for staff/moderators/VIP/donators who have another custom name/rank below their usernames since I can't afford to be a VIP/donator and there's no way I become a mod or staff, so at least another custom name/rank below my username "Copper Member" is the best way to overcome that jealousy 
And, say, another way to support the forum.
And, say, another way to support the forum.
This is a prime example of why I think we should include new and reasonably-priced donator ranks. I think a lot of people would purchase them for a few perks.
I don't remember exactly when I bought mine but I did it to support the forum, not for the added privileges. I actually turned it off for some time because I thought it looked "tacky" with my lower rank.
This is why we need Silver/Gold/Platinum/Lamborghini Member memberships. Copper does seem a bit silly when you're already a higher rank but Gold and Platinum memberships would look pretty nice. I know these would be very in demand so it seems silly no to implement them really because they have numerous benefits to the forum which would include putting an end to account farming. We could even give all the money to charity if the forum doesn't "need" the money so even more good would come of it.