Really?
I think that the Copper Membership originally created to allow developers to display images inside their posts/ threads in order to more efficiently express their ideas, plans, and the vision of their projects.
Overtime, a Copper Membership compromised at somewhat extents by scammers, shitty projects' teams, and even spambies after the launch of merit system nearly one year ago.
Some of spambies paid small fees to buy the Copper Membership and joined campaigns, shown their shits around the forum.

For real users, I don't see reasons to buy a Copper membership.
Newbies obviously need massive amount of time to discover all forum structures, serious boards, and child boards, basic crypto terminologies, and so on.
They don't need the membership and its previlidges, one of them is displaying images.
To be honest, image-attached posts/ threads from new users are among the most annoying stuffs in the forum. It is also why theymos decided restricting only Junior Members/ Copper Members and above to be able to display images.

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It depends.
If you are a developer, and have a project that announced in the forum, you should.
If you are not a developer, you should not.